It depends, what Exotics do you have for your Titan? Personally for Striker I have my Skill tree set up as such: Pulse Grenade, Aftermath, Discharge, Aftershocks, and Unstoppable. I use Codices 1 and 4. I'm still feeling out Defender because I don't use it very often, but I do know to set your bubble away form lane of fire, either behind your allies or off to the side, unless you absolutely need to drop it due to an incoming attack that will kill you. But the Suppressor Grenade will always be your friend. On to Exotics, the subclass neutral ones are great. They are: Ruin Wings, The Armamentarium, and Crest of Alpha Lupi. Ruin Wings just let you get more Heavy more often, Armamentarium gives you a second grenade, and Alpha Lupi lets you revive and get revived faster. Both Ruin Wings and Armamentarium are great for when ever, where as Alpha Lupi is more situational and couple well with Defender. The Striker Exotics are: Helm of Inmost Light, Insurmountable Skullfort, and MK 44 Stand Asides. Helm of Inmost Light grants you the skills Death From Above and Headstrong, giving you more flexibility in your build. Insurmountable Skullfort Gives you Health for Orbs you pick up as well as Transfusion with Storm Fist. Mk 44 Stand Asides, longer duration of Shoulder Charge. Again, two great ones and a situational one. For Defender you have: Helm of Saint-14, The Glasshouse, and No Back Up Plans. Helm of Saint-14 gives you more Super Energy from Non-Guardian kills as well as Blinds any and all enemies who enter your Ward of Dawn. Glasshouse allows the Weapons and Blessing of Light Buffs to last longer. No Back Up Plans allows your Force Barrier to last longer. SAint-14 is hands down the Best Defender Exotic, Glasshouse is okay, and No Back Up Plans are just meh. And as Kabr stated, Titans make GREAT snipers, especially when coupled with a sniper that has Unflinching, because they can pop up and get more shots off then either Hunters or Warlocks.