They're different. I watched Badiashile play cuz I'm a Tchouameni stan and from what I saw hes better (or at least shows more potential) on the ball. He fits the profile of the modern center back, I think hes a better athlete. Like Milenkovic, hes also really good in the air. I always thought Chiellini was pretty underrated on the ball in his prime, and Badiashile shows similar characteristics, but I think hes got even more potential on long balls. And hes left footed, so he occupies the same space. Milenkovic is more right sided. I would view Milenkovic more as De Ligt/Bonucci insurance.