When talking about reliability, I think the V6 gasser is still ahead of the diesel. Though the tranny is better, all the DEF-issues are still not resolved.
The most reliable - without a doubt - has been the HEMI.
It always depends on what your plans are. In my case, I wanted bells and whistles without high operating expenses and since I'm leasing, I figured out that the V6 gasser was the best match. Since I'm not towing but driving a lot of stop and go, the HEMI didn't make much sense to me. The diesel would have been interesting (something new for a change), but I wasn't willing to pay a premium for a vehicle with a major design-fault - and honestly, that's what the DEF-injector and its location is. From an economic standpoint, I wasn't able to take advantage of the diesel within my anticipated two years of ownership, either, so in order to pick this more expensive option, it would have had to be at least the most reliable.
So far, there are only a few issues I had to work out (new camera module for ACC and new software for tranny - I had that performed although I didn't experience harsh shifts yet due to my low mileage) and one thing that will be taken care of next week (steering wheel slightly off to the right). Other than that, I'm quite happy. The performance/econmy on this vehicle with the V6 gasser is very well balanced. This monster is 4x4, huge & heavy but still quite responsive when you put it in S - and all very close to 20 MPG on regular fuel which I find quite amazing...
2015 Grand Cherokee Summit 3.6L 4x4
, Bright White, Dark Brown interior
, Platinum Package, CD-Player.
2015 Lincoln MKZ Hybrid Reserve
, Ruby Red Metallic
, Light Dune interior
, Technology Package, Panoramic Roof, 19" Painted Pockets Wheels, Multi-Contour Seats, THX Audio.