Speculation that KD's calf strain is really a partially ruptured Achilles would rule him out.Probably Durant is all-around better at this point. Just because Durant has a better jumpshot and is more established in the NBA. Giannis is younger though and has time on his side to get even better. Even Magic Johnson predicted that Giannis will eventually bring a championship to Milwaukee.
Both healthy, I think KD has the advantage as he can more easily create his own shots.