R28; To answer your question, there are a number of brands and trypes of Exhaust Brakes on the market. To be sure, if you are pulling a good size trailer in the mountains, you need an Exhaust Brake on your truck.
Over the years, on a number of trucks, pulling both heavy farm trailers and our 5th Wheel trailers, I have used three different brands of Exhaust Brakes. From my own experience I have settled on the Banks Brake, the one I now use. It actually increases the power slightly, does a fine job of engine braking and requires no maintenance. The Banks is slightly different design than other Exhaust Brakes, but all are useful.
As mentioned above, the Jacobs Engine Brake (Jake Brake) is a different system and the one we use on our heavy trucks.