Qwiss its this for me as well. I like Havertz a lot but Gyokeres edges for me because he's a natural forward. I think he pushes teams back and makes space for everyone else. We;ve changed our attacking play to accommodate Gyokeres and I think its made us better. Kai has been out for a very long time too so in the short-medium term I expect to see a little more of Gyokeres. I really hope we use both heavily and have them fresh as much as possible though. A fresh Kai is better than a tired Gyok and vice versa.
Not exactly sure what you mean by "natural forward", but one of my main criticisms of Gyokeres is that he lacks "instinct" in front of goal. More specifically, his movement off the ball and timing is terrible. He doesn't really know how to get to the ball first, whether it is a cross or a parry. Yesterday, he should have beaten Sanchez to the ball, but he made his run too late (only after Sanchez parried the ball).