For me the WSM would and did win over the standard mag.

I chose it because it uses shorter action and it uses a bottle neck caase instead of a belted case....... Belted cases are absolutely worthless on cartridges that have a pronounced shoulder.

The standard magnum will have an advantage with bullets larger than 180 grains but with todays bullets there is absolutely no reason to use a bullet weighing more than 180 grains in a 30 caliber rifle so IMHO this argument is pretty much moot.