Well even though the bars show the same, the base is different, I noticed in two ways. First the armor parts you get out of dismantling, the titans actually, get armor plating, the warlock got like this resin or some type of chemical compound, and the hunter had like these like wires or something like that. I know this isn't enough to prove it, but this next part helps. Second, When I was doing the crucible with my hunter, I could notice the differences between all classes at full strength with the throwing blade. Hunters' health would drop to a quarter of health, the warlock's would drop to 1/3, and the Titan's would drop to 1/2. All the blades were to the chest.