Low level PVP - Warsinger
Rest situations - only Myco, it have much better DPS then Warsinger.
If you're 105+ level, you should forget about Warsinger, this bow has been made for Paladins to PVP at ~80 levels.
After you reach 120, you can get Umbral Bow, which is better then Warsinger and Myco.
Before Cipsoft added Umbral items, Myco bow was the best bow in-game.