I personally like the Titan Defender the most. I'm a dedicated Halo player, and the Titan feels like the closest thing to a a Spartan that I'll get. I'm also not the best player on my fireteam, but my time to shine comes in my ability to support and provide cover fire. With the defender class, I can aid with bubbles and buffs that will help my stronger teammates advance easier while also sinking some ammo into the enemy to deplete their health.