I'd take the Mosin. The AK just isn't accurate enough for my tastes.
I've heard 3-4 MOA is typical. If the shooter can hold to that from field positions, then it's still "pie plate accurate" to 200 yards..... I know I would have some shooter induced error what with the wonderful sights on the AK..... the power of the round would preclude me from shooting at a deer past 100 yards, even if it was all I had..... trailing a wounded animal is not my idea of an afternoon well spent.