Both auto.The dodge is cleaner, with leather inter. I'm a Ford man,my brother has a 7.3 & my dad has a 6.0. The 7.3 is down on power & the 6.0 stays in the shop for repairs. Try'n to stay away from a money pit, my car does that part.
I have 293 thousand on one of my 7.3s all stock drive it every day. Haven't spent over 150 bucks on it at one time and that is usually oil changes. One cam sensor,one injection pressure sensor and one injector wiring harness. Thats it nothing more. My other 7.3 has 120 thousand, has chip,cold air kit, 4 inch exhaust, have only replaced cam sensor. I only use it to pull my 46ft race trailer. The chipped truck definitly has more power but it is a stick tranny also. I only hope the new Ford diesels are going to be as reliable as the 7.3s has been.
Another thing to consider is the fuel mileage too. I think you will be hard pressed to find something that does better on fuel mileage than the Cummins does. I get 20-21mpg at 68 mph empty and 14.5 loaded (12K) with a 32' tag at 65 mph with my 05 DRW truck. I have a friend that had a 7.3 and he complained about the power and fuel mileage and sold it to buy a Dodge after driving mine. He is a very happy camper now too.
My first Cummins was a 99 and my friend has it now. 375K on it and he drives it every day and loves it more every day.