It's a personal preference, I'd say. Lately I've been driving with the traction control off all the time, just so I could "improve" my personal driving skill in situations like that. Sometimes the traction control helps, sometimes it's a bit of a hindrance. If you start to rely on the computer too much, you start getting a little lazy in your driving skill, IMO.
There's a steep hill here in my neighborhood that I have to take all the time (no other way in or out) and last winter when it snowed, I got the GT almost to the top of the hill, but traction control kicked in and wouldn't let me finish. I turned of trac control, mashed the gas, and just spun the tires the rest of the way up.