This guy has no idea what he's talking about. Sunsinger subclass lets you carry two grenades, no armor necessary. And it's the only class with self revive. Praxis fire allows you to carry more heavy and special ammo. The warlock has the best battle recovery, whereas the Titan has the most strength and the hunter the most agility. Take the hunter into hard mode raid and then the warlock, you will quickly see that the warlock has better survivability. The Titan does have the strongest armor (I.e. Highest toughness stats), but he is so slow.