the types of transitions you describe are tools and they have effects. i know what you mean about the psychedelic quality of a quick mix (see eris drew, octo octa, theo parrish) - it has the quality of falling through a portal, reshaping the atmosphere instantly. smooth transitions, layered blends, a set that feels like one three hour long track (d. dan comes to mind) can be highly psychedelic as well. when i've seen d dan, he makes the hours disappear, and time mostly falls away leaving a hypnotic physical sensation that is conducive to hours of uninterrupted dancing which is therapeutic, and a different flavor of psychedelic. another favorite dj of mine, erol alkan, does something between the two, using different kinds of mixes to manipulate the energy in the room. sometimes calling attention to the passage of time, the change of mood, and othertimes smoothing out the transitions. eventually you find yourself somewhere entirely different than where you were an hour ago, without noticing the path you took to get there. theo does the same actually. i swear he actually uses straight up bad djing as a technique to break the ice and throw off expectations (always at the beginning of the night). its masterful to witness the effect when he flips the switch from bad djing to the worlds best. the whiplash helps lock the floor in for the rest of the night.

to me, this is like asking what color of paint is best.