It depends on what options you want on the truck.
Some stuff standard on Denali is optional on SLT (Adaptive cruise for example)
Some stuff optional on Denali is not available on SLT (HUD for example) --- so it's not possible to option and SLT to have all equipment available on a Denali.
Some stuff optional on Denali is standard on Denali Ultimate (supercruise, powersteps and sunroof are examples)
Some stuff optional on Denali Ultimate is not available on Denali (carbonpro box for example)
And some stuff available on SLT and Denali is not available on Denali Ultimate -- standard box (6.5') for example.
and so on....
I really like HUD (rpo UV6) but want 18's rather than 20's (and refuse 22's)
HUD won the argument and so have Denali instead of SLT.
I don't want a sunroof, refuse to run the shortbox and detest 22" wheels, so the Denali Utimate out of consideration.
Previous truck, the dealer any my wife convinced me to add a sunroof. In a weak moment I agreed.
It was rarely ever opened, and ti never stayed open for long.
When ordering this truck, dealer and I had a conversation about adding sunroof.
Sorta like the Denali/SLT discussion that @TJL72 had with his dealer.
Dealer says first question his 'buyers' ask is 'does it have a sunroof'.
I say 'and how much more do they pay for a sunroof'?
Turns out it's less than the option cost...