Apple Maps is great because
1. the sign it shows actually matches the sign on the roads
2 UI is clean and clutter free
3. Takes less battery life
4. uses lock screen properly unlike gmaps
5. Better voice
Google Maps on the other hand is just a buggy app and a battery hog. However there're few things Google Maps does better
1. Which lane to use
2. Suggest new route mid route for faster speed
For me (in US) routes are exactly the same all the time.