My .02 is buy the GM. 2 years in a row on a trip to Florida, we rented a Suburban one year and Expedition the following year (both 2015-2016 models IIRC). Both my wife and I thought the Suburban rode better, had a better and more user friendly dash, and was just an all around nicer vehicle. The Expedition felt cheap, and the EcoBoost motor wasn't anything to write home about. We did drive them both for a week and put about 500 miles on, so it certainly wasn't an involved test but that was our impression. I will be shopping for a CPO Yukon XL when my Ford truck sells.