I have a (Super)Nova with all the jaws on my larger lathe (will soon upgrade the Nova, though). My most frequently used jaws on the larger lathe are the #2. I think up to 16", I'm pretty comfortable using the #2 jaws. For something larger than 16" diameter, I'd go to the 100mm jaws.
My second-most used jaws are the smaller jaws (pin-like jaws) for boxes.
Not counting "reverse chucking" uses--e.g. Cole jaws or similar.