I'd highly recommend not taking Beatrice with you. Taking her along means the boss will have extra health, which is hugely detrimental in the case of 4kings. It's all about nuking down each one as fast as possible so you're never dealing with more than one king at a time. Having Beatrice around will make their health too much to burst down before another one pops up and blindsides you, especially since she doesn't contribute much damage on her own.
Lot of great papes in here.
Alright guys, of the two most badass knights, which is your favorite: Ornstein or Artorias? I gotta go with my boy Ornstein.