VF-1 vs Big-O
VF-1, being uber fast compare to the sluggish Big-O, has a definite advantage, plus the missile spam doesn't hurt. However, I'm sure Big-O can shrug off that missiles without a problem with its thick armor and try to bring it down with his O-Thunder, Moby Dick Anchor, or his Chromebuster. BUT, VF-1 being much much smaller than the towering Big-O, he's going to have a hard time getting a solid hit...
Man, this is hard to decide...