have you used other products?
what do you use it for?
If it's for streaming netflix or movies, roku 3 is much faster and smoother.
If it's for watching local content, Apple TV is completely useless unless you're using airplay.
But airplay can stutter if you're streaming 1080p bluray resolution so it's better to directly connect HDMI.
I had a logitech google tv, and before today Google TV just looked horrible. Never used a Roku so I can't speak to that, but I do own roughly 125 movies on iTunes. It's just ridiculously simple to find something my son wants to watch, and throw down the 10-15 bucks to buy it. Wait a minute, now that I think about it, maybe that's a problem.