Huffyuv with the default settings is lossless, so should provide you with the best video quality. I say "should" because Premiere Pro has some issues with external codecs, so whenever I output to Huffyuv from Premiere it's full of errors. Sometimes random visual errors and always errors that cause Virtualdub to choke. I've searched Adobe's forums and google and haven't found a proper solution. The best workaround I've come up with is to use the CorePng codec, which is also lossless and free, and I haven't run across the same random visual errors.

DV is lossy and compresses at a fixed bitrate. It uses less bits to store the greens, and you'll notice bright reds pixelate, and sometimes horrible gradiation. I'd avoid it altogether unless your original footage is DV. On the other hand, I've never had Premiere give me problems with DV exports.