What the swb has that the others don't is folding front seats , i can't remember exactly now but i remember yet another bantering argument with Clive "best truck" and i think the tape measure said internally his 80 is not much more than a foot longer maybe 18 inches and of course the front seats don't fold .
I was surprised to find i had to use my 90 to deliver the granddaughters toy kitchen because assembled it wouldn't fit in the 80 , the 90's taller roof swung it ........ just .
I'm 6ft and me and the midget gf have slept in my 90 , totally unprepared and with luggage loaded and it wasn't comfortable . Bare in mind it still has all its seats they were just folded down - as best i could with all the junk loaded in the truck .
With the benefit of hindsight next time i loaded the truck with seats already folded and a thick duvet (because i don't have a mattress) folded over them . It was comfortable enough for someone to get frisky even on the second or third night , but you best ask her about that
Depends entirely on your long term goals for the truck i guess .
Edit , i found sleeping with our heads at the back of the truck best , sorely missed an internal rear door handle so i could open the door and make a cuppa on the bumper without getting out of bed in the mornings though .