I agree with the lift looking better. I have the AT4, but I do think the rounded wheel wells look better than GMC--and I think that's what makes the lift look proportioned. (ANYTHING is better than the god awful square shapes they had.) With that, I don't care too much for the Chinese-looking, camaro style headlights on the Chevy. I don't care for--nor do I hate---the grill on the AT4; however, I do feel the 2017's had a better GMC grill. The new Chevy grill isn't too bad.
Just my 5cents (because it was a little more opinion than just the topic)