I had a Tekonsha inertial (don't remember the model number) in my previous TV. The 2013 Sierra came with the integrated controller and I would never dream of replacing it. It interfaces with the ABS system in the truck and will actually apply slight braking to the trailer if any sway is sensed. It saved by backside towing on I-20 in Columbia, SC, when the two big rigs in front of me locked smoked all 18 wheels (little old lady ramped on in front of them going half as fast...). I stood on the brakes - nothing ever locked up, I stayed in my lane, and my rig slowed 30MPH in just a couple of seconds.
