Which map provider to choose for iOS application?

Question

iOS

The task is to develop an application for iOS. The main functionality of the application is tied to working with the map.
Actually a question of a choice of provider of cards. It must be assumed that the application is intended for use within the CIS countries.
- Yandex
- Google
- Apple
For me, this question is a complete jungle of the unknown, so several aspects are of interest at once:
1) Ease of study (good documentation, community)
2) Convenient, functional API (ready-made solutions for working with tags, clusters, etc. .)
3) The possibility of caching (this is an actual feature, because it is planned to use the application for a long time with loading large territories)
4) Well, in general, it would be great if you share your personal experience of using (choosing) one or another
UPD provider. I found a free course on working with the Google Maps SDK when developing an iOS application: https://www.codeschool.com/courses/exploring-googl...
Such things relate to the first point and are a good help in choosing.

Answer 1

I would take osm: https://github.com/mapbox/mapbox-ios-sdk