Since its 2:45 am and im too lazy to write about all of these characters and what they're capable of, ill provide informative links to help you decide a winner
Alucard - hellsing.wikia.com/wiki/Alucard
Dante - kmcgames.wikidot.com/dante
With this information, and prior details that you may know you should be able to formulate a winner.
As always voice your opinions in the comments below.