is /drk any good for sam? I'm still using my i119 koga for everything atm
SAM can get away with pretty much any sub it wants, so feel free to pick a sub that best applies to the content you're doing.
/DRK and /WAR: Good for situations you need more attack, but also lowers suvivability if you use LR/Berserk, which, ironically, is most needed in content where you're most likely to die if you use them. I personally try my best to never use Berserk and try to cap pdif from buffs.
/RUN: Amazing for magic damage heavy fights, like Omen bosses or Trove BC.
/DRG: Amazing for dynamis wave3 when you really can't afford to pull hate. High Jump allows you to go max DPS for longer.
Those are my most used subs and there's probably many more that work for different situations like /DNC for soloing, /NIN for things you need shadows on. The overall point is SAM can kinda sub whatever it wants.