well, I'll admit that I am clerking for a large district attorney's office. I've never been interested in anything other than the practice of criminal law. It's largely about going to court and getting tons of trial experience, but of course pre-trial stuff such as investigation and plea negotiations are equally if not more important. Even so, the ADAs relish being in court, and they're always excited to be in the thick of it.
I know there are many people who would love being holed up in a corner doing research. But attorneys in court every day also do legal research on a regular basis, and experience in court, whatever it may be, can only make you a more well-rounded lawyer. You will also encounter more of the legal spectrum-- judges, defense attorneys, law enforcement (on the criminal side), the experts, support staff (who are vital), etc.
I'd also like to add that I recently wrote a lengthy motion that required quite a bit of legal research. Watching the ADA make my arguments in court was nothing short of exhilirating. Here and there, I wanted to jump up and clarify points she made. Even if you don't want to speak in court, you'll probably want to be there to see your work come to fruition. There's nothing like it.