I went from an iPhone 6S to a Galaxy S8 in November, shortly after I got my GTI. Yes, Android Auto was a motivating factor, since I didn't like Carplay, or being forced to use Apple Maps.
Now that I've grown accustomed to Android, I find that I prefer it in many ways to iOS. Sure, some of the apps don't work as well as they did in iOS, but ultimately, the versatility of Android outweighs the ease of iOS (for me, anyway). It's been 7 months, and to be honest, I don't know that I would ever switch back. I sort of missed having iMessage at first, but these days, even SMS/text messaging seems old, when everyone's using a messenger app of some sort.