What I've had the best luck with is Harlequin, for pain relief and sedation. Unfortunately it's in short supply where I live. My doctor said that different strains affect people differently, just like prescription meds, and you have to experiment. The list of other high CBD strains that she gave me were: AC/DC, Blue Widow, Blue Train, Cannatonic, Critical Mass, Grape Crush, Harie-Tsu, Midnight, Nordle, OG's Pearl, Pennywise, Purple AK-47, Purple Diesel, Rafael, Remedy, Shark, Skunk Haze, Sour Tsunami, and Swiss Gold. The website leafly.com has very detailed info on the attributes of each strain.