Most will probably suggest 21/15, 24/15 or 18/18, however I'm really liking my current 15/24 build. I'm used to playing native, so I like speed. Speed, unpredictability and flexibility is what gets me kills. Besides, I've tried all the other popular shield builds, and they all bore me to death. I wouldn't go 15/21 though, you need that extra athletics from the 15/24 build if it's going to make a significant difference. However, I don't think this build is for new people who can't take advantage of the speed to it's full potential.
I'm mostly using the Niuweidao and rarely bounce if I get clean hits. I'd definitely add a blunt weapon or steel pick for a tincan opener. Armor should be light or medium.
Remember, your shield is your armor.