Toyota makes a great product no doubt and I would probably own one IF they had more space or if I didn't have a gang of kids, I have owned toyota's the past and I like them.
comparing these 2 vehicles alone with the tahoe being the smaller of the GM suv line and the sequoia being the larger of the line
the toyota has 86.x sq ft of available interior space, the Tahoe has 122.x sq ft
the Tahoe also weighs 1000-1500 lbs more
I am going to assume if you put battery assist and twin turbos on the Tahoe (like the toyota has) it would leave the toyota in the dust