My understanding is that paper tape is more difficult to apply but has a higher shear strenght; scrim tape (fiberglass) can still cause cracks, especially if there is movement along its length
The recommendation I had from a friend at lafarge was scrim tape for skimming, paper tape for tape and joint. That's always worked for me. For the paper tape apply a smear of easifil into the v of the join, push the tape into it then another go of easifil over the top. The tape should go into the v and effectively stick to the surface of the board.
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