Totally different.
Both are similar when it comes to being aggressive and a bit arrogant. But Vidal is the type that's literally like that and when he plays he runs his lungs out due to the aggression he has. It's sometimes a winning mentality and a real engine that you need to boost your midfield. He's simply a beast. When Vidal scores I can imagine him saying 'fuck yea we're winning'
Pogba, on the other, is a pussy. One of the cases of low self-confidence in the childhood so he had to boost his ego himself making a big persona out of thin air which resulted an arrogant guy full of himself. It's a different type and you can see that attitude on the pitch and even while walking. Just look how he walks. Like an idiot that's full of himself. He's the type that just wants to look good for the sake of it. When Pogba scores I can imagine him saying 'I'm the best player ever'.
If I had to pick one player to boost our team right it'd defo be Arturo and not Pogba. Also, it's not really his fault we sold him for peanuts.