Personally I like composites, if we're talking crafted. The abilities are nice.
Yumi's are also good and with good abilities.
What makes a good bow? It's Primary and/or Secondary ability, the SSI you have (quickness), the Damage Increase you have (damage), The dexterity you have (for accuracy), and also the spells you use with it. Example, chiv spell, Enemy of One coupled with Consecrate Weapon is... fantastic contribution. You're Damage Increase will go above and beyond your cap to a single mob you are focusing on with your hits.
Of course everyone's idea of the best is subject to personal taste
love,
Llexa