Kefka vs. Sephiroth

My vote goes twords Sephiroth.

Mike covered most of how I feel about this topic as well. However, one point I would like to get more on is their ultimate "weapons".

LIGHT OF JUDGEMENT VS METEOR

Maybe it was only limited because of the Super Nintendo, but I really found the Light of Judgement to be pathetic and boring. A magic laser from space (I know, I know, from the top of the tower. But still.) that only seems to have the power to zap a single house? In an instant, that laser can deal it's damage, and be gone just as fast. And when Kefka demonstrates to the heroes the power of the light... the way it just swings across the land and water... I found to be boring.

Then there's Meteor. The sheer power of CASTING Meteor scared the hell out of the Planet itself, so it summoned the WEAPONS to seek out the caster. For ten days, Meteor lingered in the sky, slowly getting closer and closer. It was not a wham-bam-gone-in-a-flash attack. It was something that made the people feel despair, and true hopelessness. Their despair only grew more and more each time they tried to get rid of it.

As for abilities, Sephiroth has insane physical strength. Kefka does not. Likewise, Kefka has insane magic power. Sephiroth does not.

But in an actual battle... Sephiroth would win. Even without Materia and post Crisis-Core abilities... Sephiroth was still insanely strong. Strong enough to kill Ifrit in one blow. Strong enough to effortlessly impale a Midgar Zolom on a tree. Strong enough to come back from the dead.

Sure Sephiroth was a little more bland than Kefka. But he is a hell of alot more dangerous.