Goffin has more weapons and hits bigger. Stronger in every area of the game. He should win easely.
Donald hits a heavier ball. Donald's ball has a lot of spin on it, because he's lefty. That will be a huge factor here as he can move Goffin off the court with that lefty forehand, plus Goffin is small and not particularly strong, so it will be difficult for him to handle Young's ball, especially on these courts. Goffin is a better shotmaker but he's not going to get the opportunity to do that in this match.