I would say that the Barracuda Blade was the weapon I used most and so it must have been my favorite. There were many others that I enjoyed for their special attacks, especially the Silver Freeze. I was very fond of the Kingfisher Sabre and Skullbone Repeater also. I had the Lost Sword of El Patron and the Dark Mutineer and found them almost identical, I kind of favored the Dark Mutineer as it was less common. The other weapons that people have mentioned, some I had and others not, I'm sure are great and fun to use. You really have to try them out to discover which you like best. Good luck on finding them all. Oh, I forgot to mention that the Admiral's Cutlass was often considered the rarest though there may have been weapons in the game that no one ever found, such as the Tomb King Doll and Adventurer Doll et al.