I also did WOS Pakistan Valley and it is quite a good smoke with decent anxiety relief I guess. Mazar i Shariff was a bummer, did not like the high, think it was from Real Seeds. Agitated me not any calming at all. Afghan Kush from WOS was good.
The Pakistan Valley and Mazar threw nanners and made some seeds but not that many to ruin the harvest. These were more pure landraces imo but they came with problems from that. Took them 11 weeks to flower or there about. Pheno variation and some leafy ones in the bunch.
Not a landrace per se but an old strain, Grandaddy Purps is a good anxiety killer. I got Ken's version. Sweettooth #3 is supposed to be good anxiety meds, almost ready to harvest one, can not wait. ST is also an old strain and to me qualifies as a 'landrace'.
I have read the Afghans or people from around (middle east too?) there only smoke the hash and leave it a year to cure before smoking it. That could affect the high as well. You could make your own sift hash with a 110 screen.
I do not worry that I get pure landrace as I grow indoors and they would not be the best choice for me. I am happy to have a landrace inbred to the point it is manageable for me with no problems of hermies, wild pheno variation, long flowering times, etc.