Currently going through a round of "future planning" and the wife has her eye on a GM full-sizer to pull road trip and future kid hauling duties. This puts us in a 2015+ Tahoe or Yukon (Suburban/Yukon XL are too big, Escalade too expensive + I hate CUE), and I'm lobbying for the Yukon Denali since it's got the 6.2L. Back in my car reviewing days, I drove all manner of new K2XX platform GM trucks (Tahoe, Suburban, Escalade, Silverado, Sierra) but oddly never a Yukon Denali; I always came away impressed with these trucks, and from what I can tell they appear to be holding up nicely. The Denali also holds its value really well, still commanding close to $40K for a 2015 with 50-ish thousand miles.
That said, I know GM's recent automatic transmissions can be finicky. Based on the limited research I've done, it appears the 2015- Denali came with one of three automatics. Early 2015s had the 6-speed (6L80), mid-cycle 2015s started getting the 8-speed (8L90), and then from 2018-on the Denali has been getting the GM/Ford 10-speed automatic (10L80). A 2018 is probably out of budget anyway, so I'd rather focus on the 6-speed versus the 8-speed.
Is one of these inherently better than the other? I know more gears is generally better but I've heard some Colorado/Canyon owners on this forum complain about programming/durability issues with the 8-speed, so perhaps the 6-speed is actually the better option if I can find one?
That said, learn me TCL!