if you let me choose, i will choose to train the 22 year-old player to a center instead of a PF. As center only need ID IS RED HD and SB, the rest of the skills are not that important to center as centers are quite one-dimensional. Moreover, ur 22 year-old player has a good ID and IS stats, and also a higher potential, it's easier to train *(But he is a bit older... bad point)*, but at least now you can concentrate in train the 19 year-old player to a PF.
I am a newbie also, it's just my personal opinion. No personal atk thank you! =)