The '15 exhaust brake is embarrassing compared to the dodges. Before I was ******d when I was towing through the mountains with my '15 it was garbage, I'm pretty confident my 6.4 and 6.0's had better engine braking than the 6.7's. Ford's lack of an exhaust brake and cummins having the new auto one is the one and only reason I would look at buying a dodge after towing with one.
And the duramaxes. My 11 and up that exhaust brake really helps. My dad said he thought the one on his 15 powerstroke was broken.