I believe that Webster will become a good player but I am concerned about the present and until such time as we have sufficient points to ensure we do not get relegated, so based purely on his greater win the ball at all costs defending, I would go for Duffy. Perhaps look again in May and...
Webster is said to be good on the ball but generally I haven't seen that as he takes an age and too many steps to get the ball under control. The only aspect of his play that he beats Duffy for is speed.
I have a horrible feeling that he will bring Webster back as he paid a lot of money for him so has to play him to justify his spending. I am not sure whether he will bring Stephens back as Mooy Propper and Bissouma did well together v Bournemouth