Does Carplay allow choosing which maps app serves the maps, or are you forced to use the apple maps? I'm sure people love Apple's app but it's given me many, many, many too many illegal directions for me to ever trust it.
I have CarPlay in my 2016 VW Golf R and the only map app that shows up is Apple Maps. I can still use Google Maps; I just plan my route on that app, and then bring up Apple Maps in CarPlay if I need to actually see a map. Google Maps continues to send driving directions through the car audio system even while Apple Maps is displayed. Still hoping Google Maps becomes an authorized CarPlay app eventually.
Neither Carplay nor Android Auto have multiple supported maps apps yet. Android Auto only allows you to use Google maps, but I don't have a problem with that since Google maps is very good. IIRC, they announced at the last Google IO that they're going to be supporting Waze in the near future.