I myself did the same comparison, and reached this conclusion:
The E62 is probably your better bet:
1. S60v3 - there's a continuously growing application database for these devices. The 9300 runs S80, which is a dead OS. There will not be any more S80 devices, so there's no reason for developers to work with it.
2. Vibrate - the 9300 does not have vibrate
3. The outer screen on the 9300 is apparently VERY limited as to what you can do on it. I haven't played with one enough to know, but I'd take the E62 knowing I can do everything.
The E62, despite the features, is certainly the more updated of the 2.