I personally say the titan just because if you learn to skate properly it's the fastest class.

It all depends on the mission you decide to run Titan is the best on any mission that involves a lot of non sparrow movement. Titan is also the preferred class in full game because of ruin wings armor piece. But any mission that doesn't involve a lot of moving on foot hunter is the most commonly used. Hope this helps out.

Wait celestial nighthawk? Haha did you mean hunter?

Sorry I don't run titan there is an armor piece for titan that gives more heavy ammo per drop. EDIT- i fixed it in the original post it was the ruin wings exotic gauntlets