Er... I would say that as long as his personality was the same I'd like either one.

...sometimes I feel like I'm alone among the massive sea of fangirls who love him for his appearance and little me who actually gets mushy when he has that "I will kill you. This is not a threat but a promise." look...

Visually it's just too hard to say "oh I like him in this form better than that..."

I do agree that in the "human" variety in this particular image he looks an awful lot like Kikyo or Kagome or some other character... but that probably has to do more with Takahashi's art style. A lot of her characters start looking alike eventually.

Holy Tamale! I think Sesshomaru is great whether he's human of demon. But I kinda prefer him being demon. Though he's still sexy looking with black hair.