For me the choice is 'B'. I realise 'B' is not as popular, but 'A' makes me think he's acting defensively - that's how the body language of the open hand reads to me. I still think you should progress 'B' even though it got less votes, but then I would say that
I would choose A, because there is more dynamic than B. Very suitable for a quick and deadly assassin like Altair! C: Also when he usually killed a victim he had his hand palm opened, A just looks more natural in that case. However, both concepts are wonderful!!
Technically, it should be B, because A should not be possible: Leo invented the blade-that-does-not-need-sacrificing-a-finger in late 14th.... So, yeah, B is the only possible solution. But meh, technic and beauty ^^
I'm torn between A and B, because I really really like the gauntlet. But I really like the fist on B too, it reminds me of the fighting stance we had to take in the martial arts class I took last semester.