Xous, from what I've heard, BlazBlue and Guilty Gear are VERY similar, which is understandable since they are sister series (made by the same people, they have parallels between them, everything. For example, Ky Kiske shares many parallels with BB's Jin Kisaragi; they have near-identical appearances and even their theme tunes have some of the same chords in them - and it works the other way too; the main character of BB, Ragna, is very similar to Sol).
I mean, if you want to look into it, go ahead, but I don't think there's too much difference between the two series.