Earlier quoted context omitted.
Google does not have the best base map info. OSM may well be the best global base map, actually. Google's advantage is their applications that use the data.
Citation please? What do base your statement of fact on?
For example compare the two following areas :
https://www.openstreetmap.org/#map=17/41.88846/12.49110
https://www.google.com/maps/@41.8884227,12.4916715,17.54z
Google Maps is lacking some details inside the park, you don't have any path, fence, grass, water tap, bench or bin.
The issue for OSM is that some less popular areas are totally barren.