Text this: Which is limit order traders more fearful of : non-execution risk or adverse selection risk?

__    __     ___      _  _     ______    ______  
\ \\ / //   / _ \\   | \| ||  /_   _//  /_   _// 
 \ \/ //   | / \ ||  |  ' ||   -| ||-   `-| |,-  
  \  //    | \_/ ||  | .  ||   _| ||_     | ||   
   \//      \___//   |_|\_||  /_____//    |_||   
    `       `---`    `-` -`   `-----`     `-`'