I found the Irithyll Straight Sword to be perfect for me on DS3, to the point that it's difficult to stick with other weapons that aren't my Goldilocks for attack speed, physical range, damage scaling, stamina usage, blocking strength and elemental damage.
A claymore is just an undergrown Zweihander honestly.
Combine with Chaos upgrade, Gress Crest Shield, father mask, full giants armor, Havel's ring, ring of favor and protection and two black flames for best results
What swords are those?
Claymores! (from ds1, 2, and 3)
Ol' Reliable swords
Zwei>claymore
Both are good though. I think 8 prefer the gravekeeper sword 9 over claymore in DS1. Unless you want specific elemental damage.
surely you mean this