for me, and that is a small audience, on Tikka's I'll be using the Mountain Tactical picatinney and Leupold PRS rings (they are steel so I'm giving up a couple of ounces for them), on Kimbers I'll take the DNZ gamereapers every time and on anything else I'll most likely use Leupold Dual Dovetails - With factory produced actions I would suppose it's a darn good idea to lap everything, it's not difficult or all that time consuming
Some years ago I put together a 257 Weatherby on a 700 action for a buddy - He bought a brand new Remington stainless for the project - Assuming all parts would be "good" I bought Leupold Dual Dovetail mounts for it but when I tried to mount the scope the scope base holes were so far out of line I wound up using the old standard Leupold mounts and had the rear windage screws so far to one side it looked weird to everyone who saw the gun - I wound up redrilling the bridge and had to customize the scope base to make it right - never assume anything is the moral I guess