To have the best chance of getting a real tackdriver out of the box, get the Sako. However, the Remington will cost less and any gunsmith worth the name can fix it if you ever have a problem, plus for a few bucks (less than the difference in price) they can bed the barrel (if needed) and smooth up the trigger and you will probably have a gun that shoots as tight as the Sako. I have never owned a Weatherby, so I can't intelligently comment on them.
For what its worth, I will say that I plan to one day own a Mark V (in either .300 Win Mag or a .338). I love the look of those stocks and the smoothness of the actions.
Good luck whatever you decide.