Wow. This is a difficult question! They both are waaay cool. Inuyasha with his Tetsusaiga, and Sesshomaru with his Tenseiga.

I would have to say Sesshomaru is cooler. After a loong, hard debate :P Because he keeps a stern face even in the most difficult situation. Like Bokusenou says in episode 51

inuyasha is way cooler than sussoumeru is because inuyasha has feelings and sussoumeru does not, and that inuyasha loves kagome but sussoumeru loves no one but himself.

inuyasha all the way!!!!!

DEFINITELY INUYASHA!!!!!!!!!!!
SESSHOMARU SUCKS!!!!!

SesshoMaru!!!! I LOVE SESSHOMARU!!! HE'S MY BABY!!!!

i think sussoumeru is hot i like sussoumeru but its kind a heard to say who is cooler i think they both are cooler