Who is the best sword-monster among these ones (Only Legendaries and above)? If you want to explain why you chose a specific monster go ahead! If you don’t that’s ok. Keep your secrets.
Though, keep in mind rarity shouldn’t necessary play a core factor in a monster’s swordsmanship. For example, I think Phantomaiden is a much more refined swordfighter than Nightrider, despite the inferior rarity.
Note: since they’re swordless in their final forms, Kunomi, Medbie and Kattmmander don’t count. Plus Kattmmander literally punches people, so…