I have a Win 70 375 and it is one of my favorite guns, taken a fair amount of African and Aussie game with it. That being said, this is the other side. Something like 20 years from now when your hunting days are over and you want to sell it or pass it on to a grandchild, the M70 may have increased 50% in value while the Mauser will probably have increased 100%. Neither are very good returns for that period of time but one was a conversation piece for 20 years and is a great heirloom to pass on.
If $11000 for a gun was not an issue, and it isn't for an increasing number of people, I would opt for the Mauser while still salivating over a 416 Rigby Double or 470NE H&H Double. I guess it is all relative.
Some consider a $600 hunt with a used $100 gun the hunt of a lifetime, others a $6000 hunt with a $1000 gun is a reasonable cost every few years, while to some a $60000 hunt with a $10000 gun is another yearly outing. I can't afford'em but they sure is perty!