de niro said:fit or not i'd take pogba over him all day long.
It really depends what your team need, they're wery different players.
Pogba's potential is unreal so I'd take him too over Vidal who's 27yo, but to me Arturo he's still the better player right now, he impacts the game vastly more, even if he's not as gifted.
Vidal's work-rate is inhuman and his motor unprecedented, he's literally everywhere on the pitch, defensive wise he may be as good as Gattuso in his prime, besides that he scores tons of goal, although he shots penalties too, which may inflate the number a bit. He's very aggressive driver and great reader, he knows when and how to take advantage of the defenders' deficiencies, very smart.
He's a CM who can play as a CB and AM, he's the definition of box to box.
Pogba is another story, while Vidal is a warrior he's pure class, very elegant player.
He is unique, I've always found fascinating the combination of height, phisicality and technique, just like Bale or Ronaldo. From a brevilineal player that's something you would usually expect, but from a 191cm player is rare.
Powerful and accurate shot, great vision and awarness of his teammates, more of a playmker compared to Vidal, better dribbling with a wider selection of trick moves in his toolbox . They are both great passer, but Pogba is more creative and unpredictable in his passing lines, very effective last toucher.
He's natural in everything he does, he's born for this, he's effortless.
I can't choose between the two, I won't choose since they're not joining my team any time soon, all I would say is that Vidal is a difference-maker, just with his presence he raises the team intensity up by a notch, he's infectious, which is something I can't say regarding Pogba, not yet at least.