sorry, i meant "denali" not the XL part.
yes you are correct, I believe the Premier has ANC as I believe the "LTZ" had it. And the cupholders are Premier and Denali only. However, The 17 and 18 SLT have the exterior trim pkg as well...chrome trim door panels, chrome exhaust as well as a different grill (but no chrome for handles and rear bumper). The SLT now has the standard digital gauges like the Premier and denali. The LT and SLE do not. It's almost like they randomly picked different things to crossover and some not. Basically the Premier has a few extra chrome add-ons outside of the HUD and MRC . Denali has different leather/stitching seats,interior, tranny, and engine. Denali has real brushed alum trim interior while SLT and Premier share the same plastic interior trim as other models. Essentially, outside of the cupholders, the interior of a Premier is identical to an SLT, part for part.
I recently replaced a seat cushion in our SLT with one out of a loaded wrecked 17 suburban premier and it's identical...a black perforated vented seat.
I am curious if all models have same sound proofing, glass, etc.
In order definitely Denali, Premier, SLT...but in my opinion the Denali is a different animal with major diff while the SLT and Premier have most in common.