In order of use:
KDE -> I did not like it. It was in school and it sucked. Might be different now. It was on Mandriva.
Cinnamon -> First time I used Mint. I loved it! I'm still using it today on my Thinkpad.
Budgie -> I first used it when I was testing Solus on my laptop and some other broken distros (sadly, none worked properly), and I did like it, very clean and simple interface. If it wasn't for hardware incompatibility, I would have stuck with it.
Gnome -> I used this a bit with Chapeau (derivated from Fedora) and it was alright, but confusing at first. Again, just like Solus, I couldn't have anything working properly, and this one only worked at a 800x600 screen resolution.
At the end, I reverted to Windows 10 on my gaming laptop, and kept Linux Mint on my Thinkpad. Best of both worlds, in my opinion.
