Alucard or Sebastion

I have been wonder for a while if Alucard from Hellsing and Sebastian from Kuroshitsuji were to meet, and be ordered to fight one another in battle who do you think will win? I don't want just simply "Sebastain will win cause I think he is hot" or "Alucard will win cause he is the most fucking badass vampire of them all". Which are both true but they don't count in reasons why or how either would win. Explain the battle, what injuries do they get, what they say... if they say any thing at all and who will be the victor.

While I have not watched the Kuroshitsuji series yet (ive got so much on my plate already), from a glance it looks like Sebastian has mearly enhanced physical traits to an extreme. Unless he reconstitute his body from nothing more than a pool of blood, channel arcane energy or polymorph his body into hell-hounds I don't think Sebastian would take it. On a side note Sebastian has a want-to-be Bishonen so hard thing going, while Alucard just doesn't give a ****.

Alucard. all the way. (and yes he is a complete bad ass) and they both ended up ...hm this is a spoiler...so I'll just stick to why i think Alucard will win. Alucard has a hulk thing going on with him. He likes fighting the strongest. Sebastian doesn't really enjoy fighting. At least it doesn't seem like he does.

Much as I would love to say Sebastian, I think I'm going to have to go Alucard... Sebastian IS fast, but his injuries still slow him down, plus, his contract with Ciel would hold him back. If Ciel commanded him to do something, he would do it, regardless, which is an added distraction he doesn't need. But with Alucard, it's all pretty much a game... PLUS HE'S JUST SO DAMN BAD-ASS!

Alucard is also controlled by Integra Hellsing. So he's equally as vulnerable to having his master used as a hostage. @bron Sebastian is one hell of a butler and I feel is a better match up against Walter C. Dornez, but because the opponent is specifically Alucard I'll entertain the notion. Simply put it comes down to the fact that despite Alucard's immense power he is only as strong as his number of souls he's acquired. At the end of Hellsing Alucard has but one soul left. Therefore the closest to mortal as he can be. Sebastian has no soul and therefore, no known weakness. Even a grim reaper can't slay him properly. The worst that could happen is to have his contract with Ciel broken thereby removing any desire for him to be in conflict and thus returning Sebastian to a neutral state of being. In conclusion, Alucard is slayable as the founding Hellsing member once did and Sebastian for all in tense and purpose is truly immortal in essence, but not 'body.'