...which role is better to learn it as? Then, after learning as that role, does it make the learning experience on another role easier?

I've no Heavensward access yet, but I'm in preparations for it. I play NIN, but lately been learning previous content as PLD. In truth, I'm lacking a bit of confidence with, what I hear, the DPS checks.

I guess I'm just trying to get an idea on if I want to push PLD or continue going as I am.