I've taken MDMA (Molly) and Adderall, separately. MDMA was good every time. The Adderall only gave me sweaty palms and the inability to stay seated. They don't compare to each other, at least for me.
I've never taken LSD, but I've done mushrooms once. After the effects started I was outside near a bay and it was humid. I started asking things like "What is wet? Is the wetness from the air different from the wetness of the water?" and I started putting my hands into water to discern the differences. Our "watcher" took us back inside and handed me Wittgenstein's Philosophical Investigations.
I read it cover-to-cover in about 2 hours and I thought it was the most amazing material. The structure of that book is very much like the thinking process of someone on hallucinogens, or rather, a dialogue between a person on LSD who's babbling and a completely sober person trying to refute the babblings. It ends up making sense though.