If I am betting smartly, I would say GGG based off his deep amatuer background and his ring IQ. However, Peter has an iron chin and can also punch like a mofo, so I would say toss up fight and Iwould put some momey on Peter if they fight and he is not expected to win on the books
I don't think Peter has that raw power to get his respect but he does have explosive power that Gennady might not see. Either way I would love to see this fight somehow get made.