User blog comment:B214/Question and Answers 4/@comment-116.75.186.9-20150129133639/@comment-77.255.46.65-20150131220603

“Except, at this point there isn’t a Holy Sacred Gear that can compete with Excalibur, Durandal or Ama-no-Murakumo-no-Tsurugi because these holy-swords are too powerful. It’s the same with the demonic-swords.” - vol3

it is matter of debate. is durandal stronger than Ama-no-Murakumo-no-Tsurugi? Hard to tell. It was counted as one of the strongest holy swords (but then where is caliburn in that quote?). It depends what do you mean by as strong as durandal. Damage? I doubt it could beat Xsenovia sword. Techinqe power? Durandal have none.

In my opinion it all comes to wielder and his type.

Oh, I almost forgot that Durandal and Excalibur merge in Ex-Durandal, so that makes both swords balanced and fit for category technique but in diffrent ways

Ex-Durandal have more passive powers (boost speed, make invisible etc.)

Ama-no-Murakumo-no-Tsurugi + Yamata no Orochi is difrent - the heads can be used for offensive technique as well as defence.

That's all information you need to decide yourself - good luck :D