Which media player is best for you? We have made a table comparing technical specifications, which may help you answer some of your questions.
Update 28.9.2017: The table has been updated to include the new Amazon Fire TV.
Compare 4K media players
Apple TV 4K and Fire TV (2017) have just been released but the other media streamers have been available for a little while. We have included players from Apple, Nvidia, Google, Amazon, and Roku.
We have four of the media streamers connected to a TV at the time of writing (Fire TV excluded) to compare features. Feel free to share your experiences in the comments section.