Sacred Fists - with or without armor?

Just a quick question, since I don't have much experience with monks. I am building an unarmed sacred fist warpriest/master of many styles monk and was wondering if staying unarmored is worth it. I can pick up Monk of the Iron Mountain to replace the evasion I get at monk lvl 2 with something I can actually use in combat and I can get a brawling armor which seems quite a steal for an unarmed fighter.

It comes down to:
+4 touch AC and CMD, 1 additional stunning attempt and evasion (staying unarmored, picking a monk's robe).
Potential: +3 more touch AC and CMD over the course of 10 levels and +4 AC with a simple potion of mage armor, stacks 100% with magic vestment.

+2 to attack and damage, +7 AC, +5 hp (picking a +2 brawling mithral shirt).
Potential: Some armor abilities like Expeditious are nice to have.

Which option would you suggest? I am strength focused so increasing my Dex past the Max bonus is unlikely.

Sacred Fist can not flurry in armor. You would be better off just playing a standard warpriest and using unarmed.

The OP may not be familiar with the errata from the current edition.

They erreta'ed that? Damn. It was cool to be able to flurry.

Post errata, I think regular war priest is better than sacred fist. No more full bab while flurrying.