Has to be Zeed for raw power. IIRC Unicron over time consumes the universe then goes onto another, on the other hand Zeed could affect several universes at once.
__________________
"Gonna need more chloroform..."
"If you look down on us, judge us, condemn us... then you shall fear us!"
Given his one and only goal is to wipe out the multiverse, crack open a cold one and float around in pure nothingness, if he could gobble up universes you'd think he'd get right on it. He's destroyed about 27 of the 100 universes at this point. Maybe he has feats of wiping out several at once, I only recall (cartoons) that he needed to really work at it to consume one universe. A toss up?
Zeed seems to be more definite from what I've seen. /shurgs
__________________
"Gonna need more chloroform..."
"If you look down on us, judge us, condemn us... then you shall fear us!"