
lemeres |

The thing with Aldori Dueling Sword is that its value is more in the fact that you DON'T need to be a swashbuckler to get a 1 handed slashing weapon to 'fully' work with slashing grace.
Slashing grace only does dex to damage, not attack. Thus, most 1 handed weapons would be useless with the feat. The level in swashbuckler is needed in that set up, sicne it applies weapon finesse (and thus dex to attack) to 1 handed piercing weapons (and weapons with slashing grace count as piercing).
The dueling sword can do finesse anyway though. So it is for nonswashbucklers, who might enjoy using a weapon with larger damage dice over the critical (which is an actual place for debate- some comparisons even between short swords and kukri has the short sword's +1 extra average damage winning out for a long time against the occasional extra damage of the kukri).