I want maximum accuracy from 55 grainers, so 1:9" is the fastest twist I'll accept. I rarely shoot anything heavier.

It really boils down to what bullet weight you will primarily shoot, or whether you want to cover all bases with maximum twist rate with a degradation in accuracy for lighter weights at longer ranges.

If all you are doing is shooting tin cans and zombie targets at 50 yards, it doesn't matter one iota.