When I joined the club, it was before Ruger ever had the notion of their proprietary 416 so it was between the Winchester and the Rigby. To me, there was no contest. Rigby wins in almost every category, with the exception of magazine capacity...most Winchesters hold one more down in the mag. That being said, I went with the Rigby and, in the Ruger RSM platform it is possible for the extractor to jump the rim which allows you to carry the rifle with 4 rounds therein. That's probably enough for all but the most off-the-rails situations. More attractive is the fact that the Rigby does, at a comfortable cruising speed, what the Remington does with the pedal mashed to the floor. Sure, you can haul a cord of firewood in a Honda Civic, but you would be better served with a F350.
Plus there is always the nostalgia factor when a serious gun nut is making this sort of decision. The Rigby has it. Remmy, not so much.