Quickest Relic/End game job

So I'm a legacy with multiple 50s and would like to start on the ol' relic whatnot after I'm finally through catching up on main story and figuring out how to play my jobs again. The question I'd like to throw out there is - what job seems to be the most needed (that is, have shortest wait time) for end game content? - I have healer/dps/tank roles all levelled up and waiting to go and enjoy all of them pretty much equally.

So far I've noticed that tank has near-instant duty finder wait for the below-level 50 stuff and DPS queues are infinite. Does the same hold true for endgame? or are there a bunch of lvl 50 tanks in a pile looking for DD since they may be bottled up at the mid-range stuff?

If that makes sense, I'd appreciate any insights.