My vote is for Benchmark ! I now have three of their barrels on my custom rifles
and will definately buy more for future projects. Customer service rating is 100% satisfied, I talked to Chris when ordering barrels and got my order exactly as specified and in all three cases was shocked to get my barrel in earlier than quoted, one custom barrel took one week !!
Barrels are supremely accurate in my high capacity wildcat cartridges and cleaning is an easy task indicating a high quality bore finishing method, checking with borescope shows an excellent mirror smooth finish with no tool marks or scratches anywhere in the full 34" length of the blanks.
Very happy with my Benchmark Barrels
I also use other brands but have no dealing with the manufacturers themselves as the barrels were purchased from Bugholes or Butch's
I like the Bartlein 5R barrels and have 4 and all are awesome
other barrels I currently use and am very happy with
Rock Creek, Obermeyer, Brux and Hart
I have not been cursed with a bad barrel yet, all are of excellent quality and shoot far better than my abilities .