I'd pick the .308 for so darned much ammo being around for it.
No significant difference for you uses in my opinion except I thnk the .308's twist should be 1:12. That's what worked best for bullets from 150 to 180 grains in M14NM rifles' 22" barrels when accuracy was important. If you'll only shoot bullet weights between 165 and 180 grains, then a 1:11 twist is best.
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