So many variables and "the best" is so subjective.
I have or had Kreiger, Bartlein, Shilen, Lilja, Pacnor, Benchmark, and Proof Research (CF). All have shot very well.
The Bartleins are on the two bolt rifles I use the most and consider my most trusted rifles. Grab and go anywhere, these rifles get the nod 90% of the time.
I have Kreigers on both bolts and autos and they shoot amazing but I just don't use those rifles as much as I should.
The the rifles with Shilens, Lilja, and Pacnor all shoot good, about the same. No slouches with any of them but the rifles just don't get picked up much.
My lone Benchmark is a .280 AI, 9 twist, Sendero built by HCR that is an absolute drill. I have used it but being heavy-er, it's for "Beanfields" and similar. Dang, I need to hunt this rifle this year…
The Proofs are on both bolts and autos and are my favorite, fun setups that are being used more and more. All of them are fantastic shooters. My next "projects" are all being planned around Proof CFs so that should show my Happiness with them.
Again, all of the above is based on experiences. None have been bad choices. If I wanted an all steel barrel, Bartlein would probably be the winner. Proof's Carbons have been very good to me and I just like the look of the CF.