With the choices you gave, I would opt for the 30-06.

Why? The 06 can do everything the 70 WSM can, and probably one step better because you have the option of using bigger lead in certain instances.

Also, compare the ammo prices. The 06 prices will be considerably cheaper since it is a much more common caliber. Forget your ammo at home? 06 shells can be found just about anywhere. Same can't be said for the 270WSM.

Don't get me wrong, the 270WSM is a great caliber, but it will cost a lot more in the long run to shoot unless you reload.