IDK. I have yet to see Drummond play at all. Davis right now doesn't have a lot of skills, but I can tell he has a decent IQ. His length is insane and his body looks like it has the potential to be KG-esque. He can handle the ball well for his size, but he still has no shooting skills (or at least I haven't seen them). He is shooting below 50% from the FT line, and has yet to make a jumpshot from the 3 UK games I've (partially) watched. UK defense is really good without Davis, but it is insane with him.
Drummond already has an NBA ready body, and then some. He is rebounding like crazy, and blocking shots like crazy. He seems to have even less of a shot than Davis though. He is shooting 25% from FT's and 40% from the field.
I would assume Drummond is a center because he is listed at 6'11 275 lbs, which is just ridiculous amount of size. That would slide Favors to PF. The amount of mass would just be insane.
I would assume Davis would be a PF, making Favors a center.
Hard choice.