CoMaps seem sincere.
For Nordic/outdoors, outcomes using either osmand/comaps/etc in practice are going to be very similar.
Both have free apps (norgeskart has a 50kr / year subscription to support and add more features), and both are incredible for navigating trails, marked and otherwise, anywhere Norway.
OSMand is a cartographer's friend - it does everything and more... With all the drawbacks of doing that.
CoMaps is better targeted to the needs of most people.
Thank you. Both use OSM. The similarities are so slight I'd be inclined to recommend a region specific map, as is our friend with norgeskart.no for those particular cases.
I admit I haven't reloaded OsmAND this year, but I do every year, and delete it every year. Moreover, for me, using OSM is partly to get away from trackers, and facebook at all costs.