User blog comment:Flamesword300/inuyasha vs sesshomaru/@comment-5126314-20130621072445

Neither. The Manga discusses this ad nauseum, and Totosai says it was all predetermined by Inu no Taisho to make sure they wouldn't be able to kill eachother; Tessaiga would absorb the powers of whatever attack its opponent uses, perhaps even Bakusaiga, so Sesshomaru will never be able to defeat Inuyasha, and whatever attack Inuyasha does manage to land, it wouldn't matter because Sesshomaru is practically immortal due to Tenseiga. Even if Inuyasha used Meidou Zangetsuha it wouldn't matter much, Sesshomaru has been able to come back from that before, twice.