Well I see the you have heard from the Ram boys club. They think the only thing out there worth having is their Fiat's and will trash talk Ford on every thread. Kinda funny really. Truth is all three are good sound trucks and they all had problems at one time or another. If you really wanted the Chevy thats what you should buy. I have only had personal experience with two 6.7 Fords, Both 2015 and both well over 250K miles with no problems other than regular maintenance.
Buy what you like!