Does the demon slayer sword have any advantage over the demon dweller sword?
Here are the abililties of demon dweller sword:
• Anti magic
• Magic Absorption
• Ability to store magic from allies and fire it.
• Shoot anti magic slashes ( in the manga ).
And here are the abililties of demon slayer sword:
• Anti Magic
• Magic Deflection
• Ability to transform into black divider
• Ability to fly by manipulating anti magic flow ( in the manga ).
So, advantages are that it can deflect magic, reach a new destructive form, and can be used instead of a broom.
Hope this helps.