No one is underrating Verratti. I have no idea where you got that from. If you think that I am, then I suggest you check out his transfer thread to see how furious I was when we didn't sign him.
In my opinion, Pogba's best is better than Verratti's best. But that is like saying a Ferrari is better than an Aston Martin. It doesn't mean that the Aston Martin is $#@!.
However, if you ask any casual football fan to name the top players, Pogba's name is far more frequently mentioned than Verratti's, and that is no accident. Which is why when I say that I am hesitant to include any cash in a deal, it's because of that.
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And for what it's worth.
Verratti is actually older than Pogba