Your question has a two word answer....do it.
The Ram controller is far superior to any aftermarket controller available. I cannot speak about the Ford or GM controllers but I'm pretty sure they operate the same way. The difference between the OEM and aftermarket has to do with how the system determines how much voltage is sent to the brakes. Although there may be aftermarket controllers that vary the voltage based on the brake pedal position (or the pressure being applied to the brake pedal) I couldn't find one. Plus, there's no way the installation could be as clean and easy as the OEM.
The way the OEM works is as you apply pedal pressure the voltage is sent to the brakes based on how much pressure there is. The system works the same if you are driving at 60 mph or sitting still with the truck in park. You get a visual display on the truck EVIC display (the little screen between the tach and speedometer). Most, if not all, aftermarket controllers (there are some good ones) vary the voltage from information derived from some sort of accelerometer or pendulum. They have to feel deceleration "G" forces in order to work, unless you physically move the manual controller on the box, and that box is going to constantly banging into your leg as you enter/exit the vehicle.
The OEM controller (Ram part number 82213474, about $250 or so) connects directly to two existing wiring plug fittings. One fitting goes to the controller (completely hidden from view after installation) and the other to the dash controller set device mounted below the radio screen. It's a simple plug and play process. There is a very good YouTube video show how to install the controller at