VB and ES (in Debates)

Taken from the Wiki:

Elven Stiletto
Base Damage: 55
Base To Hit: 60
Reduces effective AC/Endurance by 50% on attack.

Vorpal Blade
Base Damage : 67
Base To Hit: 60
Ignores 50% of effective AC and Endurance

Other than the damage, are they not the same? I mean can the ES ever over take the VB? Im hung up on the wording of Reduces and Ignores, those are two different things, but im feeling they are really the same.

Yeah, from what I understood they are the same, both imbued with the "vorpal" property.

and both "ignore", rather than "reduce"