Depends. I'll give DPS comms semi-often. I used to give them out more often. If the healer does an adequate job healing me, with no real mistakes in dungeons (I usually play tank in these), I'll typically give it to them nowadays. If the healer wasn't so good, I'll more often than not give it to a DPS who I think performed adequately. If nobody did, I have stopped giving out commendations every run, because I can't really justify doing it. However, I will give sprouts commendations sometimes, regardless of class. It really just depends. I'll give out my commendation to a DPS in trials or raids, or a tank, more often than a healer, unless the healer did an outstanding job.