There are different comfort levels of rv sofas, just because it has a sofa doesn't mean it's a comfy sofa. I would prefer a sofa that worked.
I have had u-dinettes that also worked , however, it's suppose to be camping in the outdoors, those indoor family times might not be as often or as long as you might expect.
It will also depend on how well you do your homework regarding the specs of your TV (tow veh) in relation to your expected payload and 'real' hitch weight.
Your TV might be the limiting factor and keep you from towing the larger TT without exceeding your trucks specs.