1. The Tour is faster, not by much though
2. The Curve has a lower resolution camera with no flash, not a big deal for some.
3. The Curve has "Media" buttons on the top instead of a lock and mute button that the Tour has. I find the "Media" buttons useless because the volume and mute buttons will do the same, and I use the lock button more than the music player.
4. If your a charging pod lover, like me, the Curve doesn't have contacts on the back or sides for a pod. So you can't get a Blackberry charging pod for it.
5. The Tour is a "World Phone" meaning it has a GSM and CDMA radio in it. You will be able to use the Tour in just about every country in the world by slipping a SIM card in it.
6. The screen resolution on the Curve is much lower than the Tour. Coming from a 8330, you won't notice much of a difference though.
7. The Curve does have wifi, you should ask yourself if you need that. If the network is good, then wifi really isn't that important. It does add the ability to talk and surf the web at the same time though.
8. Of course, one has a trackpad and one has a trackball. I like the trackball, but it seems that that trackpad is the new thing now. I find it hard to play Brickbreaker on the trackpad.
Typing will be much easier for you on the 8530 since the keyboard is just like the 8330, but it won't take you long at all to learn the 9630. I find it easier to type on the 9630's keyboard. I think I covered most, if not all, of the differences above. If it were my choice, I would go with the Tour, but only you know how you will use the phone.