How we compared them
We own neither box and run no test lab, so there is no stopwatch data here. What follows is four things you can check from the published listings and from how each platform behaves commercially, which is the part that decides whether you still like the box in year three.
1. The port. Both boxes publish a wired Ethernet option, and that is the one functional reason either exists. Everything else they do, a stick costing a quarter as much also does.
2. What the home screen is for.Roku’s grid treats every app as an app. Fire TV’s home screen is also a shop window for one retailer’s video. Neither is dishonest; they are different products, and this is the difference you live with daily.
3. The microphone. The Cube has a far-field microphone and answers from across the room. That is either the feature you are buying or a thing you do not want in the living room, and both positions are reasonable.
4. What the listing publishes.Amazon states Wi-Fi 6E on the Cube. Roku states that the Ultra is its flagship and does not publish a radio class or a port list, which is why our registry entry for it carries fewer specs than the Cube’s.
The four devices, side by side
Read from each Amazon listing on the dated visit recorded against that product. “Not published” means the maker does not state it in the listing — on this page that happens most on the Roku side, which does not publish a Wi-Fi class or a port list.| Device | Form | Wired Ethernet | Wi-Fi (published) | Platform fee |
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| Roku Ultra | Set-top box | Yes | Not published | Not required |
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| Amazon Fire TV Cube | Set-top box | Yes | Wi-Fi 6E | Not required |
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| Google TV Streamer 4K | Set-top box | Yes | Not published | Not required |
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| Roku Streaming Stick 4K | HDMI stick | No | Not published | Not required |
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Connectivity strings as published: Roku Ultra - Wi-Fi plus wired Ethernet, HDMI output; Amazon Fire TV Cube - Wi-Fi 6E plus wired Ethernet, HDMI output; Google TV Streamer 4K - Wi-Fi, Ethernet port, HDMI output; Roku Streaming Stick 4K - Long-range dual-band Wi-Fi, HDMI output.
The Wi-Fi column is the one that surprises people. If you were going to use a cable, the radio is irrelevant and the Cube’s 6E advantage evaporates. If you were not going to use a cable, then you are buying a flagship box for a radio — and at that point a stick with a modern radio is the cheaper way to buy the same thing.
The case for the Roku Ultra
The interface is the product.Roku’s home screen is a grid of apps that does not try to sell you anything from a particular studio, and for a household that has just canceled cable and is juggling several services, that neutrality is worth real money in avoided friction. It is also the easiest platform to hand to someone who did not choose it — the reason our pick for a less technical household is a Roku.
It is the fastest thing Roku sells, and on a main television that gets used every evening, the responsiveness of the box you touch most is not a trivial upgrade. The box form factor is also what makes room for the network socket in the first place.
And the honest costs. It is three to four times the price of a cheap 4K stick, and if no cable will ever reach the cabinet, most of that premium buys you nothing. Roku does not publish a port list or a Wi-Fi class for it, so you are buying on the strength of the platform rather than on a spec sheet. Roku’s own free channel also takes prominent space on the home screen, which is the one place its neutrality bends.
The case for the Fire TV Cube
Hands-free voice genuinely changes how a TV gets used.Asking the room to put something on, with no remote involved, is the Cube’s whole reason to exist, and if your house already runs on Alexa it slots into that rather than adding a second system. For anyone with limited mobility it is more than a convenience.
It publishes the better radio. Wi-Fi 6E is stated on the listing, which matters in exactly one scenario: you want a flagship box, you cannot run a cable, and your router is 6E or Wi-Fi 7 capable. That is a narrow case, but it is a real one, and the Ultra cannot answer it with anything published.
It is also a smart speaker. If it replaces one, that changes the arithmetic against the Ultra.
The costs are just as real. The home screen merchandises Amazon’s own video heavily, and that is the thing people get tired of rather than any hardware limitation. It is the most expensive way to run Fire TV. And it is an always-listening microphone in a living room, which is a fair thing to decline. The federal consumer advice cited at the foot of this page lands on the same practical point we make in our router security roundup: know what is listening, keep its firmware current, and mute it when you want the room private.
The third option neither brand mentions
The Google TV Streamer 4K is a wired box too, and it costs less than both. It publishes an Ethernet port and 32GB of storage, which is more than either flagship states. If the Ethernet port is genuinely why you are shopping, and you have no strong platform loyalty, it is the cheapest way to get it from a box — we compare it against Amazon’s stick line in Fire TV Stick vs Google TV Streamer. The trade is Google’s home screen, which merchandises as busily as Amazon’s.
The remote question, which is really the voice question
You will touch the remote several hundred times for every time you think about the box, and the two flagships answer it in opposite ways. The Ultra’s answer is a better remote; the Cube’s answer is not needing one. Both ship a voice remote in the box, so the baseline is the same. What differs is where the microphone lives: on the Cube it is in the box across the room, which is why the feature works when the remote is under a cushion.
That has a practical consequence worth weighing before you spend flagship money. If the thing that actually annoys your household is losing the remote or fumbling for it in the dark, the Cube fixes that, and so does a better Roku remoteon any Roku you already own — including a cheap stick — for a fraction of the price of either box here. It is one of the clearest cases on this site of a small purchase solving the problem a large purchase was about to be bought for.
If the appeal is genuinely hands-free control rather than a nicer remote, no remote upgrade substitutes and the Cube is the only answer on this page.
What the premium buys elsewhere, if you spend it elsewhere
Both boxes sit several times above a capable 4K stick. We publish no figures in prose — the live prices on the cards above are the only numbers we stand behind — but the gap is large enough that it is worth naming what else it covers, because on a cord-cutting budget this is a real choice rather than a rhetorical one.
A pair of MoCA adapters and a cheap stick. That combination gives the television a genuinely wired connection, which is the single thing both flagships are sold on, and it works in rooms no Ethernet cable reaches. For a household whose complaint is buffering, this is the better-engineered answer at a similar outlay.
An extender or a third mesh node. If more than one room is weak, the box in the cabinet was never the problem. Fixing coverage improves every device in the house rather than one television.
An antenna, for the channels you are still paying a service to watch. Local networks broadcast free over the air, and getting local channels without cable is a one-off purchase in the same bracket as the difference between these two boxes and a stick.
None of that is an argument against buying a flagship. It is an argument for buying one on purpose, for the Ethernet port or the far-field microphone, rather than because it sits at the top of the range.
The question that beats both boxes
Can a cable actually reach your television? If the answer is no, both of these are the wrong purchase and the money belongs in the network instead. A buffering 4K stream is almost always a Wi-Fi problem, and the fix list in order of value is: move the router off the floor and out of the cabinet, then work through the free fixes, then run a wire.
And if the TV is in a room a cable cannot reach, the coax left behind by a canceled cable service usually can: a pair of MoCA adapters turns a dead cable outlet into a wired Ethernet socket, which is the cheapest way to give any streaming box the one thing it wants. Pairing that with a cheap stick beats either flagship on Wi-Fi.
It is worth knowing how little bandwidth is actually at stake. The FCC’s own published figures put Ultra HD 4K video at 25 Mbps. The problem in a congested house is never the size of the plan — it is contention, which is precisely what a cable removes. Our bandwidth guide works through the arithmetic for a whole household.
Which one, in one line each
Main TV, cable available, you want the quietest interface: Roku Ultra.
You want to talk to the room, or you already run Alexa: Fire TV Cube.
You want the wired box and do not care whose software: Google TV Streamer 4K.
No cable will ever reach the TV: Roku Streaming Stick 4K, and spend the difference on coverage. Our high-end streaming roundup makes the same argument across the whole premium tier, and Roku vs Fire Stick settles the platform question at stick prices.
