The idea of Bluefin and Aurora (and Bazzite, the gaming focused one) is that they take the atomic fedora base and make an opinionated “just works” out of the box experience on top of it. Obviously that kind of customisation is going to be quite different between the different desktops.

Bluefin has received the most attention as it is the focus of the overall project, and Aurora is an offshoot with a smaller team. Both are really good though to be honest.