No, I think GM and GE and other tools are all different enough in their own right that it's difficult to compare them. I think you could learn a lot as a programmer from
trying to compare them, though.
For me, GE is more "advanced" and "professional" because I can create binaries for Phones, GP2X and Windows (plus others).
GE tackles a lot for those of us who use it. It hides much of the complexity in a nice interface (um, Makslane, are you still working your day job? what's the release schedule looking like for version 2?

).
Other tools do the same, but if
I was going to start a project like GE or GM or AGS I would argue that it's easier to do something well if you focus on doing one thing - like making Windows apps (which GM does). Of course, in GM you have to pay to be able to script. I didn't pay, so all I can do is the drag and drop functionality - which I think is pretty impressive. You can get pretty far with just that.
GE is better for me, though. So Makslane gets my money.
Anyway, the point is, multiplayer is difficult enough on Windows or Linux without getting it to work on Pocket PC and GP2X too.