TruTrac hands down. The open diff is weak, horribly unsafe in most all road conditions, and limits your ability to transmit power.
If you change things on the titan, and keep everything else stock...
Trutrac and bilstein 5100 all the way around. axle vent mod
Headers and uprev.
Those are the best components to add to a new titan to make it drive and perform like it should from the factory.