North Texas shops

I live in far north Texas. My 2018 T680 Cummins is still under warrantee. I am not a complete idiot but I can't fix most things myself and every darn thing is electrical computer magic these days anyway. I want to establish a "relationship" with a shop so I can get repairs and service done during home time and have people that know my truck.
My choices seem to be MHC north forth worth, MHC Wichita falls. There is a small independent shop in Gainesville called Bartholds. They were super good guys working on older trucks but I doubt I should use them because of warrantee.
I need advice. How to choose a shop and how to know if I'm getting good treatment or just a grease job.

 

Thank you for that input. I think I will use Barthold for everything not warrantee related. They were good to my old boss and gave me special treatment when I hauled fuel.

 

So now when it comes to warrantee work: MHC fort worth or Wichita Falls or??

 

Nothing to do with this thread particularly but I just want to say how awesome @Chinatown is. He pops in everywhere when people are looking for opportunities. You rock Chinatown!