My limited experience with disc and rim brakes. I have both right now, on both road and MTB's. With a good set of pads, either will work great. Where there is the biggest difference is in incliment weather and riding conditions. When things get sloppy, there is a definite advantage with the discs. Overall, I prefer rim brakes, due to the builder being able to make a more compliant fork, better pad life and most importantly () aesthetics.

By the way, I find truing a disc rotor way easier than a wheel. I don't use a tool. Just a slight tug does the trick for me.