I don't know if what I made is usefull but I use the calculator to make a little comparison of the two weapons :
The character has those values:
Strenght 18 (so he can use evry close combat weapons and armors of cRPG)
Power Strike 6
WPF : 100
Now we must compare the same weapon against the same Armor of 40 (Mail with Surcoat) witch is a medium armor.
I also compare the weapon against the best armor with a price nealy equal to the weapon.
Name
Swign Damage : min / Avg / max
Thrust Damage : min / Avg / max
And this is what I get :
Against Armor 40 :
Bec de CorbinSwing Damage : 25 / 32.5 / 40
Thrust Damage : 15 / 22 / 29
Long Hafted Spiked MaceSwing Damage : 24 / 30 / 37
Thrust Damage : 9 / 14.5 / 20
Bec de Corbin (7312) Vs Studded Leather over Mail (7383g)Swing Damage : 23 / 30.5 / 38
Thrust Damage : 13 / 20.5 / 28
Long Hafted Spiked Mace (4745g) Vs Druzhina Mail Shirt (4674g)Swign Damage : 23 / 31 / 38
Thrust Damage : 8 / 13.5 / 19
The Bec de Corbin's price is 1.5x the Long Hafted Spiked Mace price. And agains armor of the same price they do the same amount of damage. This is fair.
But the LHSM Knockdown and the Bec de Corbin don't.