Poppy tea hands down. Followed by pure codeine, which is also present in pods. No itching to speak of with hydro/oxycodone.
Heroin, surprisingly, didn't/doesn't give me the nasty histamine release like straight Morphine does
I'm assuming you're not IV'ing it? Apparently the histamine release is reduced when diacetylmorphine is parentally administrated due to by-passing the first-stag metabolism.