Personally, I'm a bit torn currently... I've mostly used Pop!_OS's customized Gnome desktop since I fully switched to Linux in 2019, and I am also rather eager to try out their upcoming, Rust-based Cosmic Desktop too.
However, I have come to quite like KDE on my laptop now running OpenSuse Tumbleweed. It's a fantastic experience, and honestly more distros should ship with it rather than plain Gnome.
Curious what others here say their favorite is though!
My preferences aren't super strong, but I like Xfce because of its lightweightness and customizability. Prior to Xfce, I used Gnome...which is neither of those but still fine.