My Dad had a Cummins Ram ('09 I believe). Loved the motor, but the truck was JUNK. So many little stupid issues like window regulators, central locking system, stereo died and had to be replaced, had to have keys re-coded several times to get the truck to start, check engine light all the time for carbon trap cleaning cycle.
When the warranty was up he looked at the GMC/Duramax/Allison combo but those are apparently made of gold (prices are crazy), so my Dad is driving a F250 Power Stroke and he LOVES it. Had it since 2013 with zero issues.