My main guardian is a titan and I have an almost fully upgraded Armamentarium for him. So that's the one exotic I am allowed. Just yesterday I bought an exotic helmet engram from xur and received the Helm of Saint 14. If I am to use the Helm, what chest armor should I use? And should I use both for different game types? (Helm=PvP, Armament=PvE)
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The helm will save your ass more than an extra grenade. When cheesing in vog was around the duel nade was in high demand. Now I would say the helm will benefit you more. Level them both.