In real life I would go for Matic... absolute machine. As has been said he probably is more of a player thats going to make things happen going forward compared S.Bender who is a better as an out an out defensive player. So it is really what you are looking for in your role.
Peruzzi is probably the better player but every time I have played with Carvajal he has been very solid too. If you are at United I don't see why you would need another right back. You have Rafael, Jones and Varela-who was awesome in a recent youth competition and has some potential to be a good...