Probability Distribution Functions.

Jun 2010
Hi All.
I want to know about the Probability Distribution Functions (PDF). Which one is the best method (out of Chi-Square, Kolmogorov-Smirnov and Anderson-Darling) to see if the PDF represents the availabe data well? Moreover, what does it signify (in physical sense i.e. growth, decay etc), if a data shows
1. Log-Normal Distribution
2. Wakeby Distribution
3. Beta or Kumaraswamy Distribution

PS: Thanks for the previous help, Ackbeet.