Do I think Wentz is a better quarterback than Dak? No. But I will say Wentz is able to win with little to no assets. Dak struggles when we had third-rate receivers. Dak excelled when we finally got a top-tier receiving corps. Dak wants more money, and I do not blame him for doing so. But with that being said, he does not play well with third rate receivers which the salary cap would force him to do with his new contract.
So on a salary cap restricted team with less receiver talent, Wentz is the better QB. When the offense is taken seriously and wide receiver talent is lined up, Dak is the better QB.