I've owned 3 generations of trucks so far: '93 D-250, '92 W-350, '01 2500 QC 4x4, and '09 2500 QC 4x4. All of them have manual transmissions.
332k on the '93 before losing transmission #2 and being retired for parts.
326k and counting on the '92 with 1 transmission rebuild done by me this time with no serious issues so far.
240k+ on the '01 6 speed that my wife (now EX) commandeered shortly after purchase, has had both front wheel bearing/hub assemblies, rear timing cover seal, and hydro-boost replaced.
34k and counting on the '09 that was deleted at 10k with no issues to report so far.
The most expensive one so far was the '01, but I still miss it :{
The least problematic ones for the mileage have been the first gens overall. I know that I've had to replace a few transmissions, but it was mostly due to hot-rodding and being stupid while growing up

PS... both still have the original clutch
I love my '09, but it just seems like I'll never see the same mileage I've had with the others. Too many things to go wrong and more expensive to repair when it does. And I'm not happy with having a DMF and fear that a flywheel/clutch upgrade is in the near future. And the cost of injectors is way high to upgrade or even replace a stock one
However, I do like the idea of having the ability to plug in the Smarty and change stuff on the '09, but it was far cheaper to do the same on the 1st gens by just turning a screw.
I have no idea where I'm trying to go with this, but I think that the "best" generation Dodge/Cummins truck is the one YOU choose!!
