The midfield is next year's discussion. This year we have to decide what to do with our attackers.
Ronaldo is certainly a better AMF than Dybala, he turned into a forward because he can and because he wanted to chase Messi.
In his first year he will also want to play as forward because he wants to brake that Higuain record. So it's CF or LW, assuming that Higuain will leave, which is not at all that simple, we have Dcosta, Manzdu and Ronaldo for the LW, so chances are that Ronaldo will play CF in a flat trident.
Dybala sucks as AMF, so don't put him behind him, but besides him, with Cuads and Berna as his subs, with Berna trying an AMF role at some formations.
Again i believe our main issue will be linking our midfield with our forward line, none of our midfielders is good at that role and we cannot expect everything from the wingbacks...