i have worked on lots of cummings.. there are a zillion 5.9 ones out there and the parts arent excessively high. They are not my favorite engine as they are too small for the vehicle they are put in. That being said, if ya aint hauling 60K lbs, they will work.
So, if all things were equal, i would probably buy that one...
But, one has to consider other factors... like mileage comparisons, over all condition of the vehicles, transmisssion mileages - if one is rebuilt, and one not... tires, bullet holes or whatever.. and maybe even price
I sold my coach bus and bought my thomas because i really like the turbo cat v8; and the mt643 trans - which is also very cheap to rebuild or even purchase. The cat engine is more expensive for parts than the above motors, but usually only needs bearings rolled in at 25,000 hrs.
if everything was equal... of the two choices, i would probably choose the cummings...
BTW.. you can increase the HP if ya just do a little pump work...