You get spell speed, det, and crit in such small amounts over all your gear that it really doesn't matter which one you go for, I'd say. Full L90 gear is something like +200 secondary stats, right? Assuming 1 of the "best" secondary stat, whichever that is, is worth 0.2 Mind, the difference between 200 of that "best" stat and something as useless as Parry is 40 mind. That's across an entire gearset, and none of our stats are actually worthless.

Get whatever you want; personally I'm going to start branching out to blm gear shortly despite not being full 90 because, eh, gear just isn't that great an upgrade in this game.