I am trying trying to figure out the pro's and con's between Atazine and Simazine for usage as a pre-emergent on Bermuda. What is big difference between the two as far as effectiveness and weeds controlled? I know that Atrazine has some post-emergent weed control while Simazine does not but what are the other big differences? Also, how does Atrazine and/or Simazine compare to Pendamethalin as far as a pre-emergent is concerned? Does Atrazine/Simazine cover some weeds that Pendamethalin doesn't control?