Interesting. My experience of the two is almost entirely opposite to yours, General. Yet another example of good ol' YMMV in effect
I've used them both on many occasions - seperately and also in combination with various other drugs - using a variety of administration methods but mostly plugged - and they are two of my favourite 2C compounds. To my mind they both have their own unique and fascinating characters whilst also having the "psychedelic tofu" thing going. Both are also rather lush
Before launching into my rambling personal observations, I should probably point out that I've not really taken either of them in very high doses as I've simply never felt the need to. I mostly use them (2C-C especially) for using in combos now so dosing is different anyway, but when used alone I've always found the effects perfectly rewarding at fairly modest levels. I don't exactly keep records of such things but probably mostly around 30mg in both cases and am fairly sure that I've never gone above around 40mg of either as a single dose. Although I have certainly gone well above that (particularly with 2C-D) in sessions involving multiple redosing. Weight for weight, I find 2C-D to be more potent via most MOA.
For me, 2C-C (oral and plugged) is so gentle on the body you would hardly notice you had taken anything almost. I get a light - almost relaxing - stimulation, all-round feeling of well-being and a subtle hint of empathogenic euphoria. The mental, or psychedelic, effects I also find very subtle - more a pleasing fleetness of thought than a bringer of earth-shattering revelations. Visual effects also very subtle for me - a bit of sparkle and a light ripple at most.
When sniffed I find the effects are dramatically intensified and far more psychedelic in nature. It is the only 2C that I would always use (and have ever recommend to others to use) intranasally as the MOA of choice. The difference in effect I find quite remarkable. The bodyfeel is similar - gentle and lightly stimulated, but maybe not quite so lightly stimulated. Visuals I find greatly intensified and remind me of 2C-T-2 visuals somewhat - a haze of colour and trails. The psychedelic effects are also much more pronounced and of an introspective nature with, for me, an almost dissociative feel.
2C-D (via any MOA - the differences between them are mostly the usual ones of speed of onset, levels of bodyload, intensity, etc) feels much more like a "generic" 2C compared to 2C-C. It's definitely more stimulating for me - not speedy but nicely energised - whilst still feeling very light and gentle on the body. As with 2C-C, I find the psychedelic effects fairly mild and enjoyable - light and fun than rather than heavy and soul-searching. I find the visuals to be more pronounced than 2C-C (except for sniffed 2C-C) and are in classic acid-style - breathing, flowing and rippling. One notable effect that I find is unique to 2C-D is the amazing effect it has on music - it take tunes then twists, turns and flips them inside-out and back again in a way not like nothing I've ever come across before.
I tend to think of 2C-D as being along similar lines as something like 2C-B or MDMA - mostly light, fun, social and good for parties. 2C-C is not really something I would use in a party situation. It can certainly be very social but is maybe more suited to a bit of reflective introspection and contemplation than partying the night away. Especially when snorted.
Both are wonderful substances in their own right, but to my mind are positively begging to be used as combo drugs... but that is what the psychedelic combo thread is for
