OsmAnd, while a bit harder to use (but not that much), is much better than Organic Maps: it can show satellite imagery from both Google and Microsoft (and download it for offline use!), has a 3D map view, supports coloring slopes, has a bunch of specialized functionality for hiking, cycling, skiing, maritime navigation, can record trails, can route according to vehicle dimensions and in general can do everything (except for things that require access to Google's data like routing based on live traffic data and showing data like opening hours that businesses put in Google Maps).
OSMand definitely has more features, but whether that makes it better depends on the use case. I like it in principle and try it every once in a while but could never really warm up to it, and every time I just end up going back to Organic Maps.
