I haven't really try the new smartphones like iphones or droids, but what i like about BB is:
- Emails, i work with then a lot, and is a major for me to have real time eamils.
- BBM: more than a half of the people i talk have BB's, so BBM chat is a plus to contact then and know what we'll do on friday night
- Integration: (don't know if iphones and droids can do this) but i love the fact that the most used apps, and sites, like FB, twitter, sms, mms, and the other things you put on the phone seens like they belong to the phone.
The fact that you can link FB profile, MSN profile to contacts is a big thing for me, causa that keep my contact update without even ask.