Whether I'm healing or not, I tend to favor my commendations towards the DPS classes.
I feel as though the DPS classes are often underappreciated because it isn't as inherently easy to tell when one does well or does poorly. So, I usually try to pay attention to which of the DPS tends to outshine the others and give my commendation to them accordingly.
That said, I'm not opposed to giving my commendation to my co-healer or a tank. I just feel it is often the "easy" or "safe" choice when it isn't just the tanks or healers that make or break an encounter.
