I've had an Android TV for about five years. I recently bought a TV with Google TV. I don't know if this is how Google TV has always been, but it wasn't that way in Android TV.
Seeing the home screen on the Google TV made me immediately regret the purchase. Unfortunately, the model I bought disabled the ability to make alternate launchers default. I was able to put it in app mode, but it was still plastering ads everytime you turned on the TV or hit the home button. Absolutely disgusting.
The home screen is so bad I finally set up pi-hole on my network. Now there is just a blank area where the ads used to be with a notification saying I'm not connected to the internet, although my services are fine.
I'll never by a Google TV again unless I can make alternative launchers default. I'm really glad I installed pi-hole, those TV send so much info back to Google. I recommend it to anyone.