i can say that i love the interior on my Platinum F350, the seats are extremely comfortable for me and i can spend hours in there without issue. I'm 6'2" - 215lbs so I'm not a super small guy either.
My father has the same year and model as mine however its the King Ranch trim and i find his interior to be just as comfortable as mine although he does not have the massaging seats that mine has, i love those.
go with the F350, it has much more payload capacity and honestly rides better than my previous F250 (2013) did - it's what you need for that 5er in my opinion.
My Platinum F350 SRW has a listed payload rating of over 3400lbs.
Both my father and i tow many miles per season and we really are happy with the trucks and how they perform down the road. I tow around 10000# and my father with his heavier and long cougar tows around 13500# - I've ridden in and towed both and honestly cannot tell much difference with the additional 3500lbs behind the truck.
Both 5er use Reese 5th airborn air pinboxes and the trucks are 100% stock otherwise.
While i'm sure a DRW will most likely be more stable, i cannot say that i'm not extremely satisfied with our current setup.
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