Of late, other than higher priority for op-up, I can't think of a single difference that is unpublished. Frankly, as a Gold I can say that on the ground and on board (other than op-up) I haven't received any unpublished benefits for a few years now.
Unpublished benefits used to be plentiful few years back but 2-3 years back they suddenly all disappeared. I think this change happened at the same time that PEY was introduced.