I must now deepen the topic even further.
Final Fantasy Tactics. Two more swords to add to the list:
The Chaos Blade, stonger than both Excalibur and Ragnarok (and Masamune and Chirijiraden).
The Chirijiraden, stronger than Masamune and Excalibur.
Excalibur is stronger than Masamune in this game.
In Final Fantasy Mystic Quest Excalibur is the strongest sword and weapon in the game. The others are nowhere to be found.
The sword list now is as follows:
Atma/Ultima Sword/Weapon
Brave Blade
Caladbolg
Chaos Blade
Chirijiraden
Crystal/Illumina/Ragnarok
Excalibur
Masamune
Onion
Strato