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CoMaps has been forked because of some issues with Organic Maps. So, it's better from the beginning. They solved that problems in their own fork. In fact, Organic Maps became more active after CoMaps :D
Moreover, CoMaps added some great features and changed to the better colors (for both UI and maps) while also forking new features from Organic Maps.
They're always open to community ideas, unlike Organic Maps.
For more, you can check this:
https://news.itsfoss.com/organic-maps-fork-comaps/
Because CoMaps is community-owned, it's more likely to be in active development.
However, three core developers have had issues with ownership on OM. I was an active contributor and Turkish chat admin, yet they sometimes didn't even reply to me about app issues.
I mention that page because a CoMaps member reached itsfoss and helped them to prepare it. I can also send you the OSM Turkish blog post, but I doubt you'll understand it without a translation.