Take it from someone who's owned both. I had a 2016 gasser, towed with it once, drove it straight back to the dealership and traded it in on the diesel. Needless to say if you don't plan on towing the gasser is fine. Put something behind it and it falls flat on its face even with not much weight (I had about 2500 pounds behind it). That's what happens when GM puts a torqueless car engine in a truck. The 3.6 is just not a truck engine because it makes all its torque at high RPM's. Not fun for towing I'll tell you. Got a diesel, towed with it for the first time last weekend and it grunts and pulls up hills with minimal shifting downshifting while using much less fuel. The gasser would downshift and scream on any grade or hill and it could not cruise at 100km/h without downshifting constantly and burning tons of fuel. The diesel is the s**t if you tow!