>>532003243
for reference here's the damage table for both weapons
Masterwork and Legendary quality are HUGE boosts for all weapons, often making them nearly twice as good and better than shit multiple tech levels higher.

Plasma swords normally have lower base damage than monoswords because they have a 70% chance to do +10 Flame damage on hit on top of their Stab and Cut damage in the table....but being Masterwork means it gets a straight up 50% damage boost and is now outdamaging a monosword even before taking into account the actual plasma/fire effect