Gameplay wise Black Knight. Story wise it's your opinion
This question is opinionatic. Which do you think is better?
You don't, at least not until the very end. You have to kill the 3 Knights of the Round Table. By the time you figure this out you should have already killed 2 knights and all there is left is the...
you have to past levels to get to the black smith
They are two different characters in two different series. Chose for yourself.