a factory installed tow package is the way to go, There is much more than trailer brakes involved, For auto tranny there will be a good quality transmission cooler installed, as well as separate fuse's & relay for the component/wiring,
I really like the factory ones, However, the aftermarket actuators do have another benefit, while traveling on downhill grades you can use the under dash lever to manually apply the the trailer brakes without having use the brakes on the tow vehicle, can use it to apply the brakes a bit harder on the trailer to assist in adjusting the downhill speed, anyone who ever has towed in the mountains knows what I'm talking about, I'm not sure if the factory installed brake controller has to be setup through the computer to give a stronger apply to the trailers brakes, But with my f-250 it's seems to be adjusted out equally when towing our 24 ft camper, when I towed with my older Ramcharger with drum brakes I had an aftermarket brake control,( Shelton ) I would use the lever/button to help apply the brakes on the trailer,although there are settings on the controller to custom adjust the pressure being applied but sometimes it felt like it needed a bit firmer or quicker stopping like being caught at a caution light about to turn red,