The only time Katana/Blade damage surpass Bastard Sword/Sabre is when they are carded with other modifier.
The idea is, if you wanna make it for pvp/woe/spesific target, you can card it with SGuardian+Hydra and it still depend on your str gear to make 4 slot better than 3 slot weapon. If you wanna make it for PVE, Bastard Sword/Sabre with triple SGuardian is better.
Anyway, I vote 1h sword.