GNOME 2. I tried 3 for a year or two and the task bar crashes or lack the very basic feature of swapping window position. It’s an external plugin so I don’t expect it to be fixed in any year soon. Then I realize GNOME 2 was perfect before they ruined it in 3 so now I’ve been on MATE desktop for 4 years now. I think the new team is too small to catch up on any modern changes (webp support is lacking, and no wayland) and nothing I could do can fix that (minor development work on build system, donation) but I’d still accept a perfect 2010 era desktop over 2023 desktop that doesn’t feel right after a decade of development.

You can think of it like emails. It’d be better to have more choice than just gmail.