Giannis has just had bad injury luck, I don’t consider him injury prone though.Giannis would be the better fit for the Thunder, but I don't know if OKC wants to break up their team for that, they'd be giving up a few of their key guys.
Plus, you can't trust that he'd stay healthy when it matters, he missed the entire postseason last year.
Jdub isn’t a reliable number 2 option imo. He will be the first to go