Both will get OS 5.0 eventually.
I'd go with the 9630 if you can afford it. I just switched from the 8330 and really like the 9630. Much nicer camera (3.2MP w/ auto focus) and the screen clarity is nicer as well.
Don't get me wrong the 8330 is a nice device, but the 9630 is nicer, at least to me.
No longer a BES Admin, but it was fun while it lasted!