I've been to India, but never made it to Thailand.
However, I regularly grow ACE 'Double Thai' which is a cross between Koh Chang Thai x Meao Thai

It makes absolutely fantastic hashish. This is my favorite smoke for mornings or before a long meditation session.
I've got a friend who lives in the foothills of the Uttarakhand and he once said to me to watch for strains of hash named 'creme' like Malana Creme from Himachal Pradesh, since its usually the good stuff.

LOVE the low % strains. Can't go wrong with isolated landrace charas.