By Bahamut.Raenryong 2008-04-12 12:07:36
Sorry for the late response, don't browse these forums too much lately :X
Balmung will give you more damage over time on most monsters, due to the accuracy and attack bonus all of the time (it's like a Perdu weapon without the latent), but Balin's will do more weaponskill damage.
However, Balmung severely hurts your Souleater damage, so I would not use it in any fight where you are likely to use Souleater (endgame fights etc)... however, in exp parties and merit parties where you are very unlikely to use Souleater, Balmung should be better.
Work on Subduer/Perdu Sword/Algol -- they're your best greatswords going.