my 0.02:
Jesus chose the WTS in 1919 yes? and then:
What unique teachings did they have in 1919 that they still hold to be true today?
Bethel boy may try some or all of these answers:
no hellfire, no immortal soul, no trinity - all Unitarian or Adventist beliefs http://en.wikipedia.org/wiki/Seventh-day_Adventist_Church (not surprising given the JW roots in Adventism - Google George Storrs)
preaching work - so why are other religions growing - how do they get new members? what exactly was the preaching work about in the leadup to 1919? didn't the JW's have numerous failed predictions of the end of the world at that time? was Jesus telling them porky pies?