When I bought my first F350 back in 2011 I felt there were a number of little things that made Ford a better choice for me than what GM and Ram were offering. Things like power tow mirrors, tail gate ...
You may need to clarify whether you mean right now or in 6 months. The new products from both Ram and GM are a few months out. As far as I know the Ram won't have a tailgate step but if you get the air suspension you may be able to make it drop a few inches.