For Duty Finder tank.
I am waiting 4-5min as a healer lately because there's alway a tank missing.
Not like 4-5min is a long wait at all.
Looking at shout on my server (Marlboro) I would say healer is in more demand.
Oddly enough that it differs from the duty finder.
But in the end like everyone else said play what you like and have fun ;)
It's ok, my native language is Typo, so I probably would have understood.