at this time i have all of the Titan exotics except for the Standasides and Armamentarium (though i did have a 1.0 and sharded it long ago because i just didn't like the grenade boobies and didn't care about having two nades because i never play crucible). the ones i keep using are Inmost Light (while running Striker), Crest of Alpha Lupi (just for producing orbs in the crystal room, every little bit helps), Glasshouse (for soloing the Abyss and during the Atheon fight), and Saint-14 at all other times while running Defender... which is honestly most of the time while raiding or running Nightfalls/Weeklies. Ruin Wings and Skullfort almost never get used.