The new chromecast is pretty good and $50, and until very recently the ATV was pretty out of date and overpriced. The chromecast stutters sometimes in the main screen, but actually playing videos is just fine.

You can also side load unofficial youtube apps, which are much better than the actual youtube app on the chromecast.

The LG OLED tv os was missing some services, like HBO, but it stutters less.

The only thing missing from all of these devices is a backlit remote. I don't know why they're against the concept.