Not convinced any centre-forward is likely to score many goals the way Juve are playing just now. The centre-forward should be scoring more than Llorente/Morata have, but I don't see anyone available that would score a lot.
Juve's play just isn't creating chances for the centre-forward in most games. There isn't space being created and there are few good crosses.
Better, right now, just to stick with Llorente who will occupy opposition defenders and let those around him keep getting the chances and scoring the goals.
Pazzini's excellent movement in the box may well get him a few goals, but is his lack of general contribution going to do more harm to the team's play in general than those few goals will justify?