If we're talking a band I'm in, I want one guitar, a great frontman/woman who also plays guitar and keys as needed, drums & bass. And at least 2 (aside from the lead singer) can sing harmonies and occasional lead vocals.
OR..., have a terrorizing lead guitarist that I can take a mostly back seat to, and everything else is the same.
There's no way I'd ever play in another band with another guitarist, unless they're much better than me, or just good enough to cover stuff that requires a 2nd guitar from time to time.
OR..., Guitar, Bass, Keys, Drums, Vocals, with harmonies. I've done that one, and it works well, but means you need to pick songs that have keys in them (mostly.)
For music I like, it can really be any lineup, from horns in bands like Chicago or Crack The Sky, or Elton John back when he had Tower of Power horns, on up to 3 guitars like Lynyrd Skynyrd, or anything in between.
I even dig these guys who play guitar, with only drums & bass, in which every song seems like a long, drawn-out guitar solo!!