In order to understand the better villian, you also should take into account who defeated each villian. Sephiroth was defeated by Cloud. Kuja was never defeated, instead he became "good," joining a 3-4 ft. tall "monkey boy"(also pink while in trance). I must also say that FF IX was created after numerous complaints about FFVIII having too much modern technology, and not enough air ships. If anyone has ever played the original FF on the NES, you will notice a great deal of similarity between both story lines of FF and FF IX.
Also, both Sephiroth and Kuja were able to destroy planets (Super Nova). Sephiroth did not just have a "big sword," although it does add to his appearance.
For further reference, here's the character illustration for Sephiroth done by Nomura Tetsuya (the FF Legend):
http://www.foggiaweb.it/Stefano/fina...0Sephiroth.jpg
PS: Did anyone see any cameo appearances of anyone from FF IX in Kingdom Hearts? (Although Sephiroth was too easy, and had a gay voice, he was much stronger than that annoying final boss...)
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