[FenwickHockey65]

It depends on how you look at it.

The GMC brand is seen as more premium to Chevrolet. It's how GM markets it and it's how the brand is sold in dealerships. In addition, packaging plays a big role in this. For example, Sierras will get more features per trim level.

That being said, the vehicles are fundamentally the same. Silverado/Sierra, Tahoe/Yukon, Suburban/Yukon XL, etc. Same platforms, usually the same powertrains/drivetrains, but sometimes different body designs.

HOWEVER: GMCs get Denali models. That brings a level of luxury above your equivalent Chevrolet.