Absolutely, I use OSM all the time for walking paths and mountain bike trails because the coverage of them is perfect. Google maps seems to fall short where there isn't a lot of money to be made.
Yep, I use OSM to plan runs and rides for anywhere I travel to, and then add any new trails I find.
I can't find it now, but hiking in Kyrgyzstan I took a screenshot of OsmAnd+ and Google Maps. On Google Maps was a river and empty space; on Osmand 3 rivers, uncountable paths, among those the ones that lead to the summit I had as a goal, plus natural water sources (like waterfalls, etc), and all that with detailed countour lines to have a quick visual of the difficulty of each path.