Pogbas crucial footballing education was most likely carved out at Juventus. At Juventus he was playing regulary along the classy Pirlo and other experienced winners like Evra and Tevez.
At Juventus he won league titles and played a huge role in them getting to the Champions league final, getting to the final was important as it gave him the oppourtunity to play against Barca and Real, opposed to the less competitive Serie A.
At united he played a few games for the first team, where did he learn his trade? It’s not even up for debate.