I have indeed. Point being is that a sword slash is a sword slash, a punch or axe hit is a punch or axe hit. Kratos punch and axe hit can kill gods. Geralts sword slash can kill vampires.Clearly you have not played both TW3 and GOW4. Geralt plays like a drunk ballerina compared to Kratos
There is nothing about these actions by either that are inherently powerful.
Regardless, its just fan fiction. A fun debate, but inherently meaningless. All if comes down to from my perspective is which one is more fun. I think Geralt is more fun to play as (even if the gameplay is not as slick as GoW) (though in the games, he does not kill gods, thus must be weaker).
How about...the vampires in witcher's world are stronger than the gods in Kratos world...thus, Geralt is stronger.
(This whole thing is actually a little silly).