I've only had Android Auto in my own vehicles, and while it hasn't been as buggy, it feels slow. I never use it anymore.
Their homemade infotainment system prior to CarPlay was awful, and has an overflow error which hits me about once every 6 months which requires pulling the fuse to hard reset it. As far as I can tell they keep adding new songs to a stack, and never flush it so at some point you'll reach the end of a song and it won't play any more. Once you reached that you can only use the phone function, attempts to use music result in you getting your Bluetooth connection terminated.
It was always stable for me, just sluggish.
If I had to pick I'd take sluggish over constantly buggy of course. So props there.
The infotainment setup on my Tesla though is golden with only the occasional quirk. After using that, Carplay and Android Auto feel very regressive. A guy I work with has an R2 so I got to tinker with it and I figured it would be comparable but it actually kinda sucked.
I haven't seen a broad range, but Mazda seems very fast and reliable.
Chevrolet (prior to recent models that drop it) and Honda do it well.
I don't actually know if the Toyota infotainment setup is to blame though. Since I've never encountered a reasonably stable, glitch free Carplay experience in the last 5 years, I've always just figured "that must be how CarPlay is". I have never owned an iPhone so I only get the cliffnotes version of the experience. But since it's got a 0% track record in that limited viewing, I'm either unlucky, emit magical anti-apple em waves, or am possessed by the soul of Steve Jobs favourite black shirt.
I don't know if the sensitivity to Siri can be turned down, again not an iPhone guy myself, but it bugs me how often we will be talking and suddenly the audio stops and Siri says "I don't know how to help you with that" or something similar. Sometimes we just don't talk so that we don't constantly have Siri interrupting Hardcore History.
fun car to drive too. zoom zoom :)