I personally think that BB's soundtrack was more diverse than GG's... BB had different styles even though the base for most were rock themed, there was still a jazz variant, a fusion variant, and even a baroque-esque variant of the soundtrack overall... I am mad that DJ Oh-no's songs on the album didn't make it to the actual game... The majority of those beats were nice, and if I had time to make a combo vid back then I would've put one of those beats on...
Don't get me wrong, I do like GG's music, but its not as diverse I think, well Slayer's theme is dope imo... The characters are diverse though, but even in that BB's characters are more diverse, and I'm only speaking in terms of their individual character systems... But some of BB's characters do seem like clones, hybrids, or some "advanced" version of a GG character (Litchi = A.B.A. + Bridget + Jam; Ragna = Sol (obvious); Arakune = Eddie + Zappa; etc...) imo...
I like both games, though I wish there was truly something that makes BB stand out and separated itself from this "GG shadow" that's been created in America at least...