WWB has always worked well for me. Accurate enough for my needs, which is range practice, and I have never noticed it being any dirtier than any other round. Only problem I ever had was a dud primer in a 100 round bulk pack, but considering the amount of 9mm WWB I have shot it's really not a concern of mine.
I agree though, if you put off buying any only to come on here and ask which is best, there's a good chance it's all gone now. I haven't seen anything at the Walmart near me except .32ACP and .38 Special.