NO .2 VS NO .26: WHICH DEFENSIVE PAIR IS MORE SOLID FOR YOU?

Hi! AFers, welcome to our 'Numbers Battle', just feel free to leave your opinions.

We have formed two sides in the battle for a certain topic.

Side 1: Rudiger and Semedo in No.2

Side 2: Koulibaly and Robertson in No.26

Which defensive pair is more solid for you?