What’s the best weapon for bosses? PVE

So I’m going through my second Elden ring play through, on the first play through I used 2 rivers of blood katana (friend of mine gave them to me), didn’t like them that much for boss fights, then used the Bloodhound's Fang and basically used it through the hole game cause I loved it. At the moment I’m using the Great Katana since is the best sword for me at the moment, but I’m looking for something else I can try maybe as powerful or even better, any suggestion on the best weapon on the game?