With my first and only exposure to Android TV, I have to say I'm impressed. I've been an Apple TV user since gen 1, and I can honestly say Sony/Android experience is better. The voice search is fast and returns better results (e.g., movies on my Plex server, not the iTunes store!), the TV has an IR blaster for my cable box and a comprehensive program guide, and don't get me started on the terrible Apple TV Siri remote. Since getting the Sony, I've had no need for the Apple TV so I'm considering selling it.
One thing Apple is good about is rolling out new software, though. I know next year there will be updates to the Apple TV. Not sure about the Sony. Will it get Oreo?
I suppose I can pick up an Nvidia Shield in the future if I want the latest OS, but then I'm juggling remotes again, which I'd like to avoid.
Any other Apple TV users who made the switch, are you happy you did?
Which Sony TV Model did you get? You can expect at least two major OS version upgrades. Lots of upgrades of inbetween stuff. Assistant is updated many times per year, although most of the updates are on the back end servers.