Best weapon potential? 21% of stats vs 15% of stats

I could be wrong but there was a reason that made % atk diff slightly worse than total damage and that was the first thing that popped up in my head.

Edit: ah it was because it rounds down.
Here's a sample damage formula: 1.20*(4 * STR + DEX) * (Weapon Attack / 100)
Ex. 6% Atk:
147 atk x 1.06=155.82 -> 155 which is the wep atk in the damage formula
Assuming str = 2000 and dex = 150
1.20*(4 * 2000+ 150) * (155 / 100) = 15996 damage with regular attack

Whereas 6% total damage:
Using the same stats as above
1.20*(4 * 2000+ 150) * (147/ 100) = 15170.4 ->15170
15170 x 1.06=16080

Actual difference in this situation:
(16080/15996)= 1.005 or total damage is 0.5% stronger than % atk