Well wasnt this about the 30-06 vers. 45/70?

My money is on the 45/70 in the baikal that for sure, but could someone explain to me what makes a ,375 bullet better when passing thru an animal than a ,458 bullet doing the same thing?
As i do not contain the experience from taking heavy game with either, i would be glad if i got it right before buiyng a new gun.