"thizz" is often a smaller amount of MDMA combined with a stim (most commmonly speed/amphetamine), or it can have ketamine, or methamphetamine...
"Molly" is pure MDMA, it has a cleaner feel to the high, and a "lesss worse" come-down... should come as crystals which u crush then put into a gel-tab or wrap in a rolling paper and parachute.... if its just powder its probably cut
BDD>ED