From a StackShare Community member: "We're a team of two starting to write a mobile app. The app will heavily rely on maps and this is where my partner and I are not seeing eye-to-eye. I would like to go with an open source solution like OpenStreetMap that is used by Apple & Foursquare. He would like to go with Google Maps since more apps use it and has better support (according to him). Mapbox is also an option but I don’t know much about it."
I use OpenStreetMap because that has a strong community. It takes some time to catch up with Google Maps, but OpenStreetMap will become great solution.
Google Maps is best because it is practically free (they give you $300 in free credits per month and it's really hard to go over the free tier unless you really mean business) and it's the best!