Since Titans require the most skill to play, it would make sense that they're the only ones powerful enough to take on a God. Imagine if you where a citizen in the Tower and you had to choose a bodyguard, would you want a Hunter? I'm not even going to answer that, I'll leave it up for interpretation. Warlock? Yeah why not, if they died they can come back and have a second chance at protecting you. And watching them float around would pretty amusing. Titans would definitely be the most sought after. Strong, smart, tactical, the ultimate destruction machine, or the ultimate protector, you'd wait in the corner of a bubble with an impenetrable armor buff, while the Titan broke the jaw of every blind and unsuspecting locust. 100% chance of survival.