Tidus Overdrive is a lot more powerful than Zidane Trance
BlitzAce vs Grand Lethal
who deal the most damage? BLITZACE!!!
BUT OMNISLASH AND LIONHEART CAN DO BETTER DAMAGE IF THEY CAN SURPASS 9999 LIMIT. still like my vote before:

1. CLOUD
2. SQUALL
3. TIDUS
4. ZIDANE