Well, I sent off a couple of pre-sales emails to them both - site5's had more questions, but they answered 18+ hours before micfo. I think I'll give site5 a try!
I think you would be in safe hands, Taylor is nice person and commited to customers. Have you checked they are offering a special at http://site5.com/shared/specials.php BTW: are you looking for reseller or shared hosting plan?