Demi has been much more pleasant for me than Noopept. So far, Noopept seems to provide much more intense focus and analytical ability..but it sours my mood. Demi is smoother, almost calming, with good focus, and has a better "social" lubricant.
Coop has the good fortune, lol, of putting these to the test in a rigorous academic environment. My use is harder to gauge since I work in the desert doing wildlife biology part of the time and deal with construction crews the rest of the time at work. I have to stay somewhat quick on my feet and be amicable to co-workers, construction folks who are hostile to environmental regulations..so I need the "good mood" aspect which hasn't been achievable with piracetam, noopept, and to a lesser degree pramiracetam. I'm still experimenting with all of these, stacked and unstacked and with varying levels of CDP choline so I have by no means reached a concrete conclusion on any of them.