I don't think anybody cares what Bible version JW's use, it's their INTERPRETATION of it that puzzles people.
For example they're against transfusions, they don't celebrate christmas/easter/birthdays, they think church spires are pagan, they won't fight in wars, they say Jesus was crucified on a stake, that there's no hell, and they think the rest of us poor dumb schmucks know nothing-
"If you try to study the Bible without our help, you go into darkness" (JW Watchtower 15 Sep 1910,page 298 )
For example a JW here in A2K has called me-
"ignorant...possibly malicious ...Fable Spinner...your drivel ...your desire to deceive"
Incidentally there are indications that JW-ism is a flip-flop belief; for example their publications (below) used to show Jesus on a cross, but later they changed their mind and decided he was crucified on a stake-