Justin O'Beirne begins a series with a very detailed Cartography Comparison: Google Maps & Apple Maps.
In general he finds:
- On average (different locations and zooms) Apple labels more cities
- On average they show the same number of roads, but Apple shows a few more in some cases and Google labels many more roads than Apple
- They label similar numbers of Points of Interest, but prioritize different kinds. Google shows transit while Apple shows more landmarks, restaurants and shops. Both have separate transit maps.