I had a SAUM for a while, it is an excellent cartridge, the only reason I don't still have it is I had issues with the rifle it was chambered in. It was a Remington 700 with feeding issues, but it shot 1/2 MOA out of the box. I would choose it over a WSM because it fits better in a short action. The WSM doesn't have enough more powder capacity to make enough enough difference to notice in the field.

"Before you criticize someone, walk a mile in their shoes. That way, you'll be a mile from them, and you'll have their shoes."