Tough decision. I think the 7-08 and 6.5 Creed might be two of the best, all-time, all-around cartridges for anyone, ever. Push to shove, I'd be inclined towards the 7-08. A modern, SA 7x57 and I think it's indisputable what one can do with a 7x57. It's a life-time BG chambering.

My one and only 7-08 elk kill... 150 NBT:

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“Perfection is Achieved Not When There Is Nothing More to Add, But When There Is Nothing Left to Take Away” Antoine de Saint-Exupery