I'm considering it (right now in 2017). Android Auto has Waze. iOS doesn't have Waze. I'm simply not using the iPhone very much. I have my iPad which I am happy with but for my phone it can be Android if it provides tools like Waze for navigation while driving on my radio screen since text messaging, email, web browsing and playing music work just fine when compared to the iPhone.
That said if Apple allows Waze on Car Play before I buy a new phone next year then I'll consider a iPhone.
Waze will never be on carplay, Apple will keep pushing it's pi$$ poor Apple maps onto its consumers. I have both carply and AA in my vehicle and really like using Waze on my vehicles big screen, although it is missing some features.