Pliobond is good for real leather vs the leatherette as it can really get into the rougher surface of the bottom/back. On leatherette it is already nice and smooth and even on the back, and even the manufacture uses double sided tape. For future repair both are removable, but a taped leatherette is much easier to remove than a pliobonded leatherette. Plus you don't have to put up with the off gassing smelly time as with pliobond.
But you should use a good tape, as cheap tape will slide over time, and not perform well under high humidity/hand sweat and would want to release and get loose. Pliobond doesn't have these draw backs.