Prince Daka is a reasonably tough guy with a good energy weapon. It means that he can really dish out some damage if he lands a direct hit against human opponents but Sephiroth is no human. He has regenerative abilities as well as incredible speed and power at his disposal. Daka’s attacks wouldn’t even scratch him and Sephiroth even has other powered up modes at his disposal in order to claim victory. Daka is strong but he would not be able to win this fight as it would be over before he could even think to make a move. Sephiroth wins.