Borla makes a cat back too for the Ram HD. I'm running the MagnaFlow 19200 kit (muffler and resonator). It really opens up on hard acceleration and fairly mild at idle and cruise. Crusing has a growl in the cabin, not obnoxious, but you know there is a 392ci Hemi there, except when the MDS kicks in, then it's like a burbling 4 banger is the best I can describe.
MagnaFlow has a limited lifetime warranty. If it was to fail, I might go with Borla the next go around.
I've ran Gibson, but back then it was an aluminized exhaust system. They have SS set up now, but have not revisited Gibson since then. It rusted out in a about 3 years, but good tone.
I've also ran Flow Master 50 series. They're pretty loud despite being the medium range for noise.