The 5.9 is a lot less complicated with a lot less emissions equipment. The 03 - 07 5.9 is one of the more sought after diesels.
In my mind, the biggest disadvantage is that it only has a 4 speed auto (that is more than capeable, but will run higher RPMs since it has two fewer gears). The other disadvantage is if you need the back seat, unless you get a MegaCab, they are a lot tighter than competitor crew cabs.
Dodge/RAM made a huge improvement to the trucks when they went to the 2010 body style IMO.
Now we can sit back and wait for our Fish(ing) friend to come and throw stones from what his "cousin" sees in the shop, or what he has heard from his sister in law's boyfriend's nephew's dog groomer.......