I’m using OSM data on phone - Osmand+ and GDAK (geocaching application). The missing data in these apps were the impulse for me to start with OSM editing. But except OSM, I’m also using local http://www.mapy.cz service. And streetview from google. The best is a combination of more resources. Sometimes are data in OSM much better, sometimes is explored area almost blank.
The render on openstreetmap.org is not bad, but I miss active POI’s, hiking mode and satellite view. The problem is, that there are a special projects solving each of my issues, but I’d like to see all in one place (like on mapy.cz).