The Garret

I think Dumbledore would have preferred to die at the hand of any Death Eater other than Snape, the one to whom he offered trust, sanctuary and forgiveness. At least with the werewolf, it wouldn't have been anything personal. But Snape killed him with hatred and loathing, and not just for being Voldemort's enemy; it was his own hatred, and that has meaning, whereas being torn apart by an insane werewolf is just bad luck.