Pogba at PSG would be the clubs and leagues biggest star (unlike at Real and Barca) and would generate them huge revenue with his marketibility. Their spending power would guarantee him a competitive squad every season. On top of that, its his home countly and home city (?) which is also one of the biggest and most beautiful cities in Europe. If he ever was to leave Juve, i wouldnt discard them as one of the favorites to sign him. The downside ofcourse is a relatively weak league compared to Serie A and La Liga, but other than that, depending on how Pogba thinks about his future (which we all know very little about honestly), PSG is an option for him