Then there is the obvious, the cab space! I went from a RAM quad cab, to a Durango, now back in a RAM to a crew cab. I would highly recommend a crew if you can swing it. The under seat storage, leg space and in floor storage bins are nice. Especiialy if you have children.
The difference is small enough to negotiate. If there is a difference take a look at the window sticker. One could have upgraded gears, window tint, drop in bedliner, etc. That all adds up. I think our dealerships in town charge $999 for tint and a drop in bedliner. Insane!!!!