Depends what the price difference is, the 2016/17s have the new shifter, electric steering, an updated transmission (8HP75 on the MY17 CRD), Acoustic windshield, and aluminum suspension components.
One of the worries with the 2015s is that some of them have been sitting in warehouses for a while not being used, so you are likely to have some deterioration on hoses and the like. But maybe just get a 2 year old used one that has had light use might be ok.
My understanding of the warranty is that all MY17 plated cars get the 5 year factory warranty, the older model years get the extra 2 years provided by eric insurance. I believe it is provided at no charge on demo/new MY15/16 models, but it is still the eric insurance version, which has fine print associated. They also offer it to existing owners for a charge, I didn't bother.
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MY14 GC LTD CRD-ORA2/QL|Mopar 18" Night Fever Rims&RockRails|Chief Hooks&Sump Plate|STMaxx 275/65R18
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