With the higher cost of the diesel engine option, the high cost of maintenance including oil changes, and the current premium cost per gal of diesel vs gas (although this is improving), there are probably very few use cases where the diesel ends up cheaper than the gasser. But if cost was the big driver for all of us we'd all be driving base model Chevy Sonics.
The diesel engine itself will likely outlast the rest of the vehicle. The complex emissions system has been the biggest problem for most owners. There are a lot of good threads on this forum discussing these issues, most of which involve DEF product choices, DEF injector clogging, and catalytic convertors failing. Assuming all these issues get resolved by Chrysler before the mandated 8yr/80k emissions warranty expires, these could be very solid long-term vehicles. And if you don't mind doing your own maintenance to avoid $150 oil changes it might start making financial sense at some point.