Advice needed for a new diesel (Duramax or Cummins)
 

I am a former LBZ duramax owner and recently sold it and have been looking heavily at the new 15 GMC duramax's until I went an test drove a dodge cummins. I could not believe the difference in a lot of things starting with interior. GM's do not have rear AC vents, rear heated seats, hidden storage in the floor, LED lights underneath the seats, (up until the 15.5's GM's didn't have power folding tow mirrors) in the GM's where the transmission cooler is at in the front, they don't have a grille to block rocks, bugs etc. from damaging it. What are some of your opinions/feedback? Anything is greatly appreciated. I just want to be 100% before purchasing a 50k truck. I am comparing between a '15 GMC or '14/'15 cummins.
Thanks, Shane