I can't say weather or not the cut is better than the buttoned ,I ve had both and both shot great. I will say that I'mvery happy with the 5R barrels , I've had a few Rockcreek's , one Obermeyer and currenty have one Bartlein. Haven't shot the Bartlein yet but runng a REALY tight patch throug it it feels smooth as glass and looks as good as any other custom barrel I've had. The Obermeyer barrl was able to get higher speeds than listed with the same listed charge and shot great "Doublegobble" here now owns that gun and can attest to its quality.
Also the 5R barrels will be a little easier on your bullet at top end speeds and pressures.