4 set Disc. which off piece

[Narlya]

Hello, :)

So I've been hurling myself around with this, looking at how others gear and basing it upon the current stat prio.
I play a 25-man. I am currently playing Crit heavy, but i sometimes switch to Mastery based on boss, and what i do.

Right now, i got all 5 set pieces. (lucky rolls)
I was wondering which off-set should be the desired one.

I went for Legs, getting either the master one or crit one. But I noticed a portion of players going for chest being off-piece, I can only guess it is because of the lack of spirit on the tier chest.

Any insight would be appreciated.

[Jhazrun]

Chest is what you'd most of the time rather pick a spirit option for, yes. Spirit makes mana, and mana makes heals. I like heals.