if two guys pretty much look the same as far as size, yes you need to get into the details to separate them, one of them holding a tiny bit more water in the lower back area or whatever bullshit you need to come up with to justify you picking one over the other because unlike boxing, we can not have a draw.
but.
when one of the guys is fucking massive and carry a shitload of more muscle than the other guy and is in good enough shape, condition-wize, it should not come down to conditioning.
give it to the bigger guy.
bodybuilding need to be about who packs on the most muscle, not about who is the best at dieting cutting water.