I've only made a couple of projects using dpn's, and quite a few using circulars. Personally, I'm finding I prefer dpn's. Granted, it may make for somewhat slower knitting (for me), but I tend to get bored so easily, and using dpn's helps break up the boredom for me. I get so tired of having to stop and slide the stitches around on circulars. That's just me, though.