Edition
Mint's own desktop. The default, and the one that gets the new work.
Built by the Mint team on GNOME technologies, with Muffin handling windows. It's the most complete of the three: applets and desklets, editable panels, window effects, and the defaults that need the least adjusting.
It's also the heaviest — which on any machine from the last decade means almost nothing in practice.
On Wayland: the Wayland session lives here first. It is being finished now, with both sessions supported side by side as the goal.