Well, if you are going to be the primary arcane spellcaster, that pretty much rules out the Duskblade. You just won't have the area effect spells (our good friend, Fireball, for instance) or the utility spells.
Duskblade gets you a spellcaster with better armor class, better BAB, better fortitude saves, the ability to quicken and channel spells, free Combat Casting feat (lame by itself but used as a prereq. for a bunch of prestige classes), access to more weapons and a spell list focused on offensive spells that target individual opponents.
A Duskblade with the right feats would probably make a decent front line fighter. A Battle Sorcerer is more of the "artillery" of the arcane casters.