I was a long time OsmAnd user, I loved that app. After a couple of years I realized, I really liked the cusomizability, but in the end, I use like 5% of it's features. I gave Organic Maps a try (now Co Maps after some community drama) and it was love at first sight. It's the opposite is OsmAnd, a lightweight and super simple app to look for places and navigation. I miss like one, maybe two features, but I the usability is great and I won't look back.

On-device routing and the map rendering is way faster in CoMaps.

OsmAnd has way more features.

If you just need basic navigation, I tend to go to CoMaps

OsmAnd is a great app for powerusers. CoMaps is a simpler, and more user friendly.

For me, I have both of them.

co-maps I use when I need to add a place to open street map, and OSMAND I use for features that co-maps doesn't have.

Basically, co-maps is easier to use for things that it can do and OSMAND is harder to use but can do more things/different things.