Swords as cool looking as the Cold Iron line shouldn't be so inferior to the line that's purchasable in Haven. :(
The increased damage against undead doesn't even make the CI line do more damage to undead than the Lev line does, that's just... sad.
So yeah, basically I prefer the way the Cold Iron Vanquisher looks but all I ever hear about is how much better the Leviathan is, and I believe it, since my Cold Iron Carver's damage is pretty lackluster even against undead.
I originally went for the CIV over the Leviathan because if you look closely at the tool-tips the CIV shows near-infinitesimally more damage than the Leviathan. I assumed the fact that the Leviathan started with slightly higher damage at it's base value was there to counter-act the increased Undead damage. But when complete, CIV still under-performs in comparison, shown in the tables on the wiki.
While I think the CIV needs to be at the very least equal to the Leviathan, considering the extra effort we put in to get the recipes. I strongly believe, however, that if you're going to keep it as being the inferior sword, then the tool-tips [which, without any values given, are a little arbitrary I suppose] needs to indicate it's lower complete-level damage.