Hi. i asked the same question, and had the opportunity to do some direct comparisons. my best friend started growing after me. we both now have more than a dozen grows, him actualy a couple dozen. both very happy with the quality we got after we got the bascis down. we also share strains such that for strains we start (all from seed), we share cuttings for clones. His buds were always looser than mine for ones that were cloned. we both use water-only soil most of the time, but i have tried coco a couple of times with ame results in density. the big differences between our grows were - he uses (used now) HID lights and had his colas and buds much closer together with not much clearance while i always try to keep the colas separated. I smoke in a pipe or occasional joints while he vaporizes, and after grinding I found it hard to pack enough of his in my bowl, but like the way his rolls in joints better. We both would get similar yields per plant by weight. I did some direct comparisons (what a chore

) in joints rolling by weight (0.8g/doobie) and the ones from my denser product end up smaller than from his fluffier buds. But - I do truly think that both gave the same effect, and this was tried many times for scientific reasons only - hah.
But- appearance means quite a bit, and he has gone to producing tighter buds now, even though he consumes 75/25 edibles to vaporizing - he does it for medical use, me - recreational.
IMHO, if the plants are grown, harvested and cured equally, there is no ascernable difference in potency/effect by density. but - we have been brought up to like the tighter buds so that's what we go for.
My commercial grow producing friend ends up with buds somewhere in the middle, and i havent done comparison with his, primarily since he grows almost exclusively sativas while i stay with mainly indicas or middle road hybrids. maybe tests sometime near future, since he is about to gift me a few clones of his nicest. freaking things take 10 to 14 weeks to flower so it will be awhile.
sorry for long winded. be well.