IIRC The Debian installer gives the option to install multiple desktop environments. Just check mark all the ones you want and it will install them. Then at login there’s a little drop-down list and you can pick the one you want to use. So that’s a super easy way to try all the ones you want to try. I like Mate. It’s basically a really nice polished version of Gnome. And there are some really cool, weird modern ones too. So you may as well try those out too and stick them on the list.