I tried an in-dash android unit. Sent it back…it’s basically a very cheap tablet will all the distracting/non-driving friendly apps menus and notifications. The one I bought couldn’t even be locked so if it gets nicked your Google account and all saved passwords, emails etc are accessible and on a known device so no 2 factor authentication etc.
I bought a Sony android auto unit which was the only proper after market one I could find that wasn’t designed for a lowered Vauxhall corsa with silly menus (Pioneer I’m looking at you)
I’ve not tried the standalone ones but I would be treat them with scepticism!