Of all the Brandish weapons the Cautery Blade and it's could be line are the most balanced weapon of the entire family
4* Surgical Sabre
Normal damage + DMG vs Slime High
5* Amputation Scimitar
Normal damage + DMG vs Slime High
With no status and normal damage you would have a good reliable weapon for every situation in the game and while not the most powerful weapon in the game it would not punish the player for picking a weapon line that they might not know ends at 3 stars.
I dont think normal damage would suit Brandishes. The charge lets out those wave's which I dont think will make sense with Normal swords.
This is just my opinion.