Easy to say since you don't have a choice. Considering essentially the entire scouting community acclaimed Oden as the best center prospect since Shaquille O'Neal, you're either crazy or lying.
The fact that the "being better thing" is debatable when Bynum is in his third season and Oden just barely past his third game pretty much proves Oden is a much, much better talent. Bynum should be far and away better if he
were a compable talent, considering his huge edge in NBA experience.
It's okay to admit Oden is a much better talent, even if he's not on your team. Really. Look, I can do it: Kobe Bryant is a better talent than Brandon Roy. It's not that hard to admit truth even when it doesn't benefit the player on your favourite team. Arguing Bynum is a better prospect/talent for the future is quite similar to arguing Roy is a superior talent to Kobe.