The quality and reliability of the Maps alternatives may vary from country to country. I live in Germany and have tried the apps mentioned here.
Result: Only HereWeGo is reliable and is in no way inferior to Google Maps. Addresses are found without errors and the best route is displayed. In online mode, reliable traffic warnings are available, including radar warnings (only deactivated in Germany because they are illegal there).
Both Magic Earth and OsMand proved unreliable, often with incorrect route guidance and incorrect destination, and also with longer times. I was surprised by this with Magic Earth, as the programmers live in the neighbouring Netherlands.
I don't know how HereWeGo performs in non-European countries, i.e. whether it is similarly reliable or perhaps less so.
My criteria:
- no Google if possible
- fast and safe route guidance
- free offline maps
- real-time traffic jam warnings and information about road closures
- good privacy policy HereWeGo delivers all of this, in my opinion!