Is this replacement vehicle a daily drive or just a tow vehicle? If just a tow vehicle I would go with the 2500 Suburban. I have no factual evidence that the 2010 Suburban 2500 has a 4:10 rear end. But my two 2500 Suburbans both have/had a 4.10 rear end so I'll bet it does.
If a daily driver and a decent rear end (3:73 or 4:10) go with the Escalade. It's not a great tow vehicle, but it will do fine with a 6,000 lb trailer. And it will be a nice vehicle to drive around when not towing.
I'm curious though why a V nose trailer would prevent you from having a weight distribution hitch? Is it a contact during turns concern? Almost all of the hitches hang under the tongue so they should not contact anything.
One more thing, don't be put off or reject a Suburban with just a torn up drivers seat. You can buy new seat cover and foam as needed and install for about $500. I'm not talking about just an add on seat cover but an actual replaced seat that will look like new. I know in my search for a replacement Suburban I passed up many seemingly good Suburbans based solely on the torn up seats. Only after I finally found my current Suburban (with an already replaced bottom seat cover) that I learned that it was even possible.