What is passed off on the street is often not real hashish. It's got stems or plant matter in them still, and they're not very pure. Actual hashish is pure trichomes (the resin glands that contain THC). Most good weed runs around 17-25% THC, but hashish is average 20-40% THC.

the problem is, most hash isn't made in bubble bags by the home grower (and if it is, he/she already smoked it). Most is made in countries like Mexico, and made in massive quantities in poor conditions.

I personally like both. They're kinda like drinking beer, and taking shots.