I've got CarPlay in my 2016 Golf and it's useless. Why on earth I would want my car to take over the full functionality of my phone is beyond me. The only potential advantage would be running Apple Maps on my in-dash screen if I didn't have a Nav system already, but I do. And frankly, I'd rather just clip my phone to the dash than have all phone controls taken over by my car.
From the folks that use Android Auto with the car, many of the frustrations seem the same. It seems slightly better from a functionality standpoint, but less stable.
Waze may be the game changer. If only I could buy a cheap android phone and add it to my data plan without paying a ton of money extra each month...