Instead of saying why you like one or the other, tell what you don't like. For example:
Maximus Arcade:
- supposed to support old Mame32 gamelist ini - but doesn't.
- no feature to set ambience directory, etc, so you have to dig in the help file to find out there's a file that you just put everything in. Um, hmm.
- theme editor seems made for those familiar with business-level image editing programs. Also, for some totally weird-ass reason, MA crops the corners of the image.
- OH, and that sneaky thing he does to your system in that makes you have to purchase it, regardless of taking it off. I think this expires in a year, because I was....finally...able to try it out again without buying it. Of course, as I'm having issues with easily getting it how I'd like, the trial date's probably going to expire before I handle them.
(I dunno, maybe the issues I have with FEs are rare. Wouldn't surprise me, actually.)