It's a very different approach. Personally, I could never fit OSMand into my daily routine, but this one has been great.
It's not a reskin, it's built from the ground up. Although it is technically a fork of a fork (not OSMand).
For me, much more user-friendly and intuitive and even quicker. They both use open street maps data, but I think they are worlds apart. I haven't done any testing with OSMand for a couple years, so I couldn't tell you which specific features are different.
I find it very easy to read, day or night. It's quick to add a destination for navigation. It's very easy to create updates directly from the app that will upload to OSM.