Re: I'll stick with my MATE
Gnome Metacity Flashback is a decent alternative to XFCE, I find. It runs with a much, much smaller memory footprint than does Compiz, and as it is only a 2D system, uses a lot less memory.
I find that I do not miss 3D desktop effects one little bit; most of what I do involves what is in each window, be it Firefox, a terminal or whatever and I use the window manager to, well, manage these windows and manage the virtual desktops. Gnome Metacity Flashback does this perfectly. It works, works well and does so consuming minimal resources.