Which is more pure?

dry ice extracted trichomes or butane extracted trichomes?

If you used the same material to make both?

Since one would be drier, does it make a difference?

Butane extract is more concentrated. If you use good butane, they're equally pure. it's more of a style thing ... mechanical v. solvent concentrate. cn

Cool, I've made dry ice hash (I call it blonde hash) And I've also made QWISO hash and to me the QWISO seemed to last longer but there was less of it.

What I like about the butane process is recovery ... you get high 90s % of your actives. Not sure that qwiso will match that, and the butane extract is cleaner in makeup and flavor.
Dry/wet ice bubble hashes are gourmet stuff imo ... but the recovery is always a bit light. cn