Wainwright looks like he has fully recovered from TJ. Verlander's velocity has been decreasing the last couple of years which is a big concern. Overall they are pretty close to a push in terms of value. I personally value Wainwright a little more. That combined with the fact that you are getting Polanco puts me in favor of accepting the deal.
I don't know the logistics of the league but as long as the league is fairly standard, I would take the deal or try to counter and take the deal if he rejects.
Sorry misread the post. Decline the deal.