As always, the "better" BlackBerry is a matter of personal choice. If you have a few days before you have to decide to return yours, visit a retail store or friends that have BlackBerrys that you are interested in. Play with some of the other models, ask specific questions about how they work ( more detailed that "what's better"?)
__________________ 1st Step in Troubleshooting: Do you have a BlackBerry Data Plan? 2nd Step in Troubleshooting: Pull the Battery.
I'd get the Bold because of 3G but if 3G isn't important to you then get the 8900. I have an 8900 and it's a great device. The smaller form factor and better camera is also another added benefit of the 8900.