This is a really good question. I strongly considered the Ram (Laramie Longhorn) when I was deciding on my 2019 Denali. The interior was decidedly better in my opinion, and I especially like the panoramic sunroof. Where things went wrong for me was that ridiculously oversized ram's head plastered over everything. Wherever you look, the jarring, shiny animal head is staring at you, and the one on the tailgate is big enough to double as a satellite dish. All of the ersatz cowboy stuff seemed a bit over the top too (fake belt buckles on the map pockets...seriously?). While I tried to convince myself I'd get used to it somehow, the exterior of the truck nagged as well--it made me think of a committee of hipsters arguing over which shade of beige was more vegan friendly.
Checking out the Denali, there was none of that. The style was bold and timeless, and struck me as something that would age well as the miles piled up. While a bit bland, the interior was really conveniently laid out and gave you the sense that this truck would perform however you needed it to. There was also the 6.2 engine, which felt both stronger and smoother than the Ram's hemi. Decision made after the first few yards of the test drive.
I won't argue that my decision was largely an emotional one, but I have to admit that some prejudice entered the process. Growing up, GM made all of the "cool" cars to my eyes, and on some level were an aspirational brand. I'm really enjoying the truck so far, and I hope it will provide years of enjoyment and utility.