Offensive. Self buff are most of time hard to cast (may result in a instant Backstab Death) and weapon buff are too limited in time and use and may cause you're opponent to run, which is annoying as hell
I use weapon buffs most of the time. Uchigatana +15 w/ 40 dexterity + Sunlight Blade = 730 damage. Also, lightning defense is usually lowest most armors.