If mpg is a concern the Tahoe ... if fast is good then Esky.
If the Esky was a Premium it'd be a tougher choice, but I'd pick the Tahoe cause new and low miles. Plus the 13 LTZ has pretty much every option the Esky has, including ventilated heated seats and heated steering wheel ... although I'm surprised it doesn't have a sunroof. Does it have the roof mount DVD system?
---------- Post added at 04:59 PM ---------- Previous post was at 04:52 PM ----------
I see you asked the same question on CF.
Just be mindful that that place is full of sillies who exaggerate their mpg. If you do all city driving with a AWD Esky you will be lucky to get 10. If you do a tank all highway you'll get about 17.5 at 75mph. I do a mix of both and my lifetime mpg is 14 according to OnStar. You can add about 1-2 mpg better if it's a 2WD, and you can subtract about the same if it's an ESV.