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Roku wins on 4K content
Assuming you can discern the finer qualities in 4K video, you’ll find more to enjoy with the Roku 4. Right now, Amazon’s Fire TV only supports 4K video from Netflix and Amazon, and the company isn’t even allowing 4K playback in third-party apps.

The way Fire TV handles 4K playback might be to blame. Instead of outputting in 2160p all the time, the Fire TV runs at 1080p, then switches to 2160p output when playback begins. The process feels a bit clumsy, and as AFTVNews speculates, Amazon may want to be careful about opening it up to any app.

Whatever the reason, the result is a much wider 4K app lineup with the Roku 4, which always outputs in 2160p (with an upscaled 1080p interface in apps and menus). In addition to Netflix and Amazon, users can buy or rent 4K videos from Vudu, M-Go, and UltraFlix . Plex can serve up 4K videos from a networked storage device, and YouTube’s vast 4K video library is available for free. Smithsonian Earth offers subscription nature videos in 4K format, and you’ll even get higher-resolution images in the photo apps Flickr and 500px.

Roku also offers a handy “4K Spotlight” app that brings some of this content to the surface. It isn’t the prettiest app around, and jumping out to separate apps just to learn the rental or purchase price of a movie is a major hassle, but at least it provides a glance at what the box can do.

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