The slower the dry the better is the general rule. I have tried both many different times for various reasons. I tend to get a better flavor if I just hang them and trim when dry, I think because they dry slower. Now a days I usually pluck anything that isn't a sugar leaf when I chop the plant, and then let them dry before I actually manicure the buds at all. This has been giving me a nice product in less time then not trimming at all, but they still take several days to dry because I leave some leaves, and I leave the buds on the stems. After about 4-5 days drying they get manicured, and jarred for curing. I usually don't have to burp the jars for more then a day or 2. I need to build a nice drying room eventually, as I feel strongly that the drying and curing is just as important as the growing.