I only have experience with Gnome out of the two but I haven’t had the urge to switch yet. I like the look of it (I like that it looks different to Windows), the simplicity and the customisation with extensions (only a few and small ones, I recently started using OpenBar for some customization but I could do without). I keep my system rather minimal and I am not looking to put a lot of time into theming or customization.
I also tried Cosmic and I like the tiling aspect of it, but I also don’t feel the need to switch. Maybe once it is released and I can figure out how to install it on Aeon.
Julia, since I used it for some projects this year but never for something “time critical” like AoC with a new problem each day. I really like that it’s simple like python but with strong typing. Originally I wanted to use Ocaml to learn it, but on day 1 I realised I don’t know how to do anything in it yet 😄.