I really do not think the DEAD elk will complain or tell you that he wished you would have used one over the other.

From a .270 and 7mm-08 on up to what ever you wish you will end up with a dead elk if you can put the bullet where it is suppose to go.

Having said that neither one would be my pick simply because I do not like belted cases. Personally I would choose WSM in the caliber of your choice.