I am mostly C, but have had D also on a few occasions....I really consider both equally bad. It's not fun being C for so long, feeling like "I HAVE to go but I CANT, why???", it's stressful not being able to poop. But with D, not fun either, having to stay in the house or near a bathroom.
Both cause much anxiety! Oh, to have normal bowels again, wouldn't that be wonderful! Some things that people with normal bowels take for granted (as my boyfriend says).