Blind Melon
Bluelighter
Not sure what strains fight pain the best; but I must say that edibles seem (to me) to have the strongest physical impact of all the ROAs available to Cannabis users. I would strongly advise edibles for pain.
Obviously certain strains have genetics that have been nurtured to produce higher concentrations of different alkaloids to give them certain characteristics,but the rule of thumb is that they all do the same thing at certain times of flowering,just some have more CBN/CBD than THC and the other way round,so if you get the timing right you can get the right kind of high/medicine you want.