They are both decent deals tbh, although an 11 Luxury should be closer to $45K ... keep in mind that both the next gen Tahoe and Esky will hit dealer lots in about three months, but the Tahoe you're looking at will take a bigger depreciation hit simply because it is new by merely driving it off the lot. The Esky will also depreciate more than normal on account of the new gen but it won't take the more significant new car hit.
It's a tough call, both are actually great vehicles, so I don't think you'll find a great deal of fault with either one of them at those prices. Personally I'm a sucker for WDT and don't care much for silver on Escalades so I'd roll the Hoe just for that reason.
Of course there's always option three, which is to find a well priced newer Denali, which will give you the Escalade 6.2 and AWD with an LTZ equivalent interior, priced somewhere tween the two.