I main a healer, my partner mains a mnk. In the 2 years we have been playing together I have like 2000 comms, he has around 167.
For this reason I always degault to a random dps on my list. They just arnt given enough love.
If there is a greenleaf, I will give it to them.
If the party sucked - no one gets it.
If the tank or off healer really impresses me - then I might give it to them.