@Bass X0, yeah, the Joe comic got REALLY solid in the upper 20s to the Cobra Civil War. It's interesting to see how well the Joe comic has aged relative to the cartoon. Where as I feel the opposite is true of Transformers
My favorite crossover fight was Thor vs Shazam/Captain Marvel. Early in the fight, Thor discovers that Billy Batson needs lightning to transform, and being a god of lightning he simply denies him that.
I mean, there are some people who really approach this from a somewhat reasonable standpoint, coming up with a plausible scenario and a setting that creates a fair environment that doesn't favor one character.
The "who would win in a fight" discussions are really just people trying to make "which one's better" into something you can theoretically measure objectively, usually in a very specific way they think they've predetermined their favorite will win.