I think for Skullgirls I might just start off with solo Peacock to really learn her zoning patterns and how to player her well on point. Then I'll pick an assist, most likely an AA like Cerebella. If Peacock can use her triple gunshot assist then she'll be a very valuable assist character, but from what I gather so far you have to mash out the 2nd and 3rd hits, so you can't use the full 3 hits as an assist, which sucks.
SFxT is like every other Capcom game since 2008 - the combos look cool but no AAs or zoning and Baby's First Ground Footsie Game weight it down. You know, in addition to gems and the Smash Bros Super Mode (I'm drunk right now so I can't remember the real name). It's a rental AT BEST, and it's only a buy then if you really, really love the fact that it's SF4 with more complex combos (which I guess you would...no offense or anything, I just know you like[d] SF4). If it didn't have Gems or Final Smashes then it would be a buy though.
Oh, and how much do you wanna bet that the online is ***? Just sayin.