Like a guy said on 6mmbr.com today, "a good barrel is a good barrel". He was referring the thousands of barrels he has sold and couldn't say one configuration was better than another. I can't say through personal experience either, but I own one 3 groove and one in 5-C. Both barrels clean up nicely even after quite of few firings, and warm barrels. The canted land rifling is said to be more gentle on a bullet, but I cannot begin to understand what all happens to the bullet when its traveling down the tube.
3 groove rifling, there is more meat to each rifling, so it makes sense that they would reduce wear/erosion. I have also heard that cut rifling last longer to a comparable button pulled barrel. All major brands are putting out great barrels nowadays.
