the rails have a versatility advantage in that you can do either a 5th wheel or gooseneck hitch. The turnover ball is a cleaner looking install. We had problems with the turnover ball in my brother-in-laws Mega-cab in that the bed is a little shorter than a standard sb truck. The turnover ball couldn't be installed right over the pumpkin and had to be moved forward enough so that the ball would clear the pumpkin. Clearance issues might be something for you to look at also if you have a short bed. Alabamafrog has a good idea with his hitch. I like that for a shortbed
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