It all depends on what you need it for...
I use to be an enormous BlackBerry fan, and in a way, I still am. But I have learned that there are much better smartphone options out there, but all depends on what your need is.
Personally, I carry a D2 and a BB 9650. I was only using the D2, and had my Corporate email set up, along with my contacts and calendar on it. Then I was offered a free blackberry, and being a gadget dork, I couldnt turn it down.
My 9650 is for business use, and only gets used for email on my company BES, I rarely use it for anything else, an occasional phone call here or there and a text or two. I can type emails faster on the BB keyboard than the D2, but it isnt a significant amount faster.
My D2 gets used for EVERYTHING else. Internet, personal email, media, apps, etc, etc, etc.
Blackberry OS can not compare to Android, in terms of UI, Apps, Browsing, etc.
My choise is Android, it can do everything my blackberry can, and then some.
But luckily I have the best of both worlds, and get to carry both.