Regarding injuries, Oden's obviously was more devestating, shown by the amount of time missed.
Size? Bynum is 7'1, 280. Oden is 7'0, 245. This is from both's personal website, where both update with stories regularly.
Emotion? Haven't seen Oden on the big stage so no telling how he responds.
Age - Bynum turns 21 at the end of October, Oden turns 21 in January so their really is no age difference.
I'm not saying who you should pick or not but most of your evidence was faulty.
Opening night this question likely is answered.