Magil looked "about thirty" while Guile's 24 or something. Guile's about drinking, gambling, enigma, going "heh" and "interesting...", but for the most part he actually sort of talks like Magil. Like if he was younger, less serious, and didn't know who he's supposed to be!
I like Magil more because he's what Magus originally developed into. I'd like Guile more if he lost his memory some other way, instead of Magus pussing out, and if he actually had some sort of realization and conclusion instead of "well that was weird, I'ma go get a drink".