I have used both here in Alaska on our large brown bears and "know" that the 375 has to hit a little " harder" --- but in real practice I have never noticed it.
One advantage the 9.3 does have over the 375 though is an extra two rounds down in the magazine.

Phil Shoemaker
Alaska Master Guide,
Alaska Hunter Ed Instructor
FAA Master pilot
www.grizzlyskinsofalaska.com

Anyone who claims the 30-06 is not effective has either not used one, or else is unwittingly commenting on their marksmanship.