Too bad Meteor needs approximately over 9000 years to reach the earth. Enough time for an emo kid and his friends to kill Sephiroth as gay angel in front of a yellow/pink whirlwind. And Supernova is just a shitty, long move. If it would really crash planets (including earth/gaia) then the fight would be instantly over. Instead Supernova is not even able to kill the mentioned emo kid, the kiddy ninja, the pissed off black, the big tit bar *hore, the cuddly toy, the furbag, the smoking wife beater or the gothic coffin dweller
Sephiroth TRIED to become a god. Nothing more but a wannabe
Kratos KILLED 2 fuc*ing Gods (Persephone and Ares) and becomes later the God of War.
His blades of chaos have at least the same range has Sephiroths Masamune.
Kratos spells are at least as powerful as Sephiroths.
Kratos impales a 50m hydra along with its spawns on a shipmast. Sephiroth impaled a 10m Midgar Zolom on a log. Not bad, but Kratos is still better.
Oh and yeah Sephiroth cut a cannon in Crisis Core. A computer simulated cannon.
Seriously the only thing Sephiroth could do is outrun Kratos and hide. If Kratos would find him, a blood-fest would initiate.