What does calculating percentages tell u Ts? The baselines are different. Wouldn't a focus on the actual numbers be more useful?
No, for my second post I took the same baseline for all percentages (chainmail + greatsword with no fighting style). Using percentages feels easier to compare different effects like +dmg and +hit, but you can just multiply with the baseline DPR to get absolute numbers if you prefer.
And I'd add what seems to be missed in regard to Defense style, is that the plus 1 only matters if you end up needing it and by how often you end up needing it. Being 8-13% more survivable doesn't matter all that much unless that's the difference between staying on your feet or going down.
So while the earlier poster was right in that +1AC is theoretically better for someone who already has a high AC, that character may already be survivable enough.
The same argument holds for damage, though: if you already have a lot of damage, then you run more risk of overkill, so getting even more damage is not that useful. This is another difference between dueling and archery that's ignored in my comparison: the +hit from archery has less chance of overkill (but does run the risk of being redundant against very low ACs).