What is the difference between Blackberrys and other cell phones that have QWERTY boards?

I am up for my new every 2 with Verizon and I don't know what to pick! I am able to get a Blackberry Curve 8330, or a variety of Samsung phones, like the Alias 2. I am not sure what the blackberry is giving me that the Alias 2 isn't. I don't plan on using the phone to go on the web or email, but if the Curve has other things on it that might be worthwhile (like PDA type things) that might be cool. Any suggestions?