That's like asking what's the best flavor of ice cream. Some say chocolate others Rocky road, I myself prefer rum raisin. Mint is also good for a first user and has Ubuntu as it's base so trying desktop interfaces is a snap, just pick the one you want to try and add it on. I use the gnome3 with Cairo dock.
Once you install a new interface you can switch from one to another by simply logging out, click on a different one log back in. Seconds . No reason not to experiment.