In my opinion, The Armamentarium is probably the best Titan exotic. You can use it with both sub-classes because it grants you an extra grenade. I had the Helm of Inmost Light before but I didn't like just being limited to one sub-class when it came to the perks for it. I've never had the Helm of Saint 14 but from what I've heard, it's only good for crucible, but don't let that stop you from using it.
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I already use Armamentarium, but it's only old version, and need to level him up, so want to use a newer Exotic like these two helms.