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Full Disclosure: I ended up going Denali after owning Chevy's forever...mostly based on exterior looks...its a personal thing, but I just liked the GMC better...and liked the upscaled Denali interior, and the availability of a lighter interior...If I was deciding between AT4 and Z71, the availability of a lighter interior may swing me toward stomaching the Chevy exterior...again, these are personal things..they are very similar...the GMC intended to be slightly more upscale...and thus commanding a bit more cash.
My gut says you should go for AT4, but again, its personal...I think if you get them equipped equivalent, the upcharge for the GMC is added value (Included Connected services, fog lights, laminated glass, nicer inside, ventilated seats). Your current 7K difference added some relatively expensive options over how you equipped your Tahoe. But, only you can decide if that is worth it or not.I do like the interior of the Denali the best and the cost of it over the AT4 / Z71 isn't a deciding factor, but we have a 3 year old boy that is not easy on things and having the nice Denali interior seems like a waste. We also have a chocolate lab that travels with us so I would feel less conflicted with them dirtying up the Z71 or AT4.
I'm not sure I would pay $7K more for the AT4 if the ventilated seats were the only thing I really wanted and was paying for the power boards and sunroof or other stuff. $7K isn't nothing. However, I can say that I originally ordered a Denali that did not have the power boards. i ended up with the AT4 because I found one available, but it did have the power boards. My wife and kids love those running boards. I'm 6'4" so I couldn't care less, but it's been something i didn't want that has ended up being something they like more than the ventilated seats (that I still very much care about).This is my only real reason I keep considering the AT4...but for $7k more I cringe, sigh.