i voted psilocybin simply because a mushroom trip is pretty short in earth-hours, and, for me, there's no hangover, whereas with acid i'm shot for days after tripping... and for me, acid turned out to be pretty scary, whereas mushrooms are simply beaaauuutiful. i feel super-unproductive and unable to accomplish anything more than a simple task after acid (though, the last time I did it was the night before a boat ride and a 7-hour drive, so that probably doesn't help the grudge) but after tripping on mushrooms, i can still balance my checkbook, AND sleep, and afterwards i retain a sense of calmness and awe... they seem to be a very gentle drug. but to each his own, of course! i think i understand why acid-heads are so into the stuff because it is truly mind-blowing.