Differences of 3 libraries in voice programming ?

Question

I searched online for 3 speech pronunciation libraries: "System.Speech.dll, Microsoft.Speech.dll and Interop.SpeechLib.dll". I want to know their time and origin, in which 3 libraries easy to use to write code ? Which library supports many countries' voices ? Which library is the most popular with programmers ? In the future, which 3 of the libraries will drop out ? et... ?