Car navigation? Locating shops? Generally no, and overtaking Google Maps is hard in this fields.

Hiking, cycling - Google Maps is not usable, at least in places that I visited, while OSM was great.

Doing anything interesting with data, like making own map, making map-based decorations (I made some laser-cut maps), research involving geodata, data analysis and anything more interesting - it requires access to data.

OpenStreetMap is allowing to do things completely out of scope of Google Maps, so in many cases it is not even competing.

But if you are individual driving car and you are not trying to eliminate Google from your life? Then Google Maps app is often superior.

Yes. not for everyone and everything, but yes. Especially if on foot or bike, but in my area it generally feels like the better map. (and in reverse I'm sure there's areas of the world where OSM is lacking in detail) I basically only use GMaps to search for businesses.

And of course I can use OSM data in many ways I can't use Google data.

I rely on Openstreetmap instead of Google Maps for a few things. Most notably, Google extremely de-emphasizes rail infrastructure (except in Japan). In addition, Openstreetmap also does a better job of laying out political boundaries for more minor polities than Google.

Yes https://opensource.com/osm