I have always towed with 2500 Subs. definitely an advantage over the 1/2 tons. Bigger brakes, leaf spring rears, stronger axles, differential, etc.
Yes firmer ride, but I like the truck feel. I've got 178,000 miles on my current '01 and it is still going strong.
I have the big block 8.1 which they discontinued a few years back, but my brother has the 6.0 in his 3/4 ton and loves it, and gets better mileage than me.
I'm not sure how wind noise would be any different between a 1/2 and 3/4 ton?
Twitch, btw I think you mean 6.0, and the LTZ is only available in a half ton.