Trez value must be very low.
I dont know about IQ, but i think Amauri is more valuable in term of price.
If one has to go it could be Amauri, as he is giving very little to the team right now.
But anyways i would have liked to see him playing in a more solid Juventus because lets be sincere... in this Juve , players like Messi would turn into the everyday Molinaro in a matter of weeks.