We've had several Tahoes/Yukons over the years. Hands down it would be the only choice of the three for me.
First off you have so much more room/comfort comapred to the other two, ESPECIALLy if you are a bigger guy. For whatever reason both the Grands and the Commanders the seat seems to sit too close to the door for my taste and I feel like my shoulder is crushed against my body while driving.
I guess if you were looking for cheap the GC could be a contender, but based on what you have listed the commander wouldnt even be in the conversation. Just compare new prices of those two vehicles. Then you mention towing compare the 4l60 to the commander tranny... For my money if the prices were reversed I would stillfavor the Tahoe, given that its also cheaper that is a no brainer.