Gotta go with John Wick, if for no other reason he will kill you if you hurt his dog and is likewise understanding when you deprive someone of their kneecap because they shot your dog.
If I'm lucky enough to take this contest you can split the win if you want and award the wick's to a 2nd place.
Absolutely the winner is John Wick, for his killer instinct, battle skills, gunshot accuracy, bulletproof suit and beautiful face.
John Wick movies are so successful to make it a JOHN WICK universe, which makes this character more attractive.
Like the majority here, I'm going with John Wick because he is a fanciful killer whereas Alejandro is more of a real-world killer; fantasy beats reality.