While I love everything about my Lone Wolf sit and climb climber, I wouldn't rate any of their hang on stands high in the comfort category. They all have simple platform seats, no backs. Still great stands in all other aspects, just not ideal for extended sits.
I've never used one , but I checked out the Millenium Monster hangon ($240 @ Sportsman Guide, best price I found) and looks like it would be a good stand for a larger fella such as yourself. I think bohunr is on to something, looks pretty comfy.
I've used similar setups in the past , a ladder stand with a hang on off to the side and it worked well. If the other hunter is considerably shorter than you, you may want to put your stand a little (not much-6-12") lower. I've found this helps assisting the hunter if need be.