WARLOCK ATW

Probably the Titan, since it has missiles, machine guns, and possibly a rail gun, depending on what you choose for your Titan loadout. The Hunter just has whatever he brought on his hunt, most likely a rifle, and the Warlock has whatever arcane spells he knows. The Hunter would definitely go down first, but the Titan would eventually win. [spoiler]In Destiny, probably a Warlock.[/spoiler]