
I don't have a well-defined method for determining this, it's a feeling sort of thing and depends on the role I'm in, who I queued with, and the duty.
Maybe something like this:
Assuming I'm queuing solo and the healer is leeching/esuna-ing (if available at that level) and keeping up with things I'll probably hand it to the healer first.
If the healer is just going through the motions or is doing terrible things (fluid aura for no good reason, sleep-walking through the duty) or I'm the healer and the tank is keeping things off of me then I may hand it to the tank.
Failing these or if the dps is really solid then a dps will get my commendation.
I wish I had metrics for it, I suspect that it's a pretty even distribution between roles though (factoring in that I normally am queuing with a healer in most duties).
Maybe something like this:
Assuming I'm queuing solo and the healer is leeching/esuna-ing (if available at that level) and keeping up with things I'll probably hand it to the healer first.
If the healer is just going through the motions or is doing terrible things (fluid aura for no good reason, sleep-walking through the duty) or I'm the healer and the tank is keeping things off of me then I may hand it to the tank.
Failing these or if the dps is really solid then a dps will get my commendation.
I wish I had metrics for it, I suspect that it's a pretty even distribution between roles though (factoring in that I normally am queuing with a healer in most duties).