I've found that the nice Indica couchlock stone gives me the best mental edge. I may not be able to move, or move fast, but I've got my wits about me now. I find playing poker ripped is a lot easier and more enjoyable for me; I'm able to calculate pot odds, observe and read players, etc. Sativas just make me race nonstop. I think part of it is my heart beat increases and that touch of paranoia forces my thoughts to race.