I don't know much about other boards specially the PA 80/60 but as an I-30 owner, I'm listing the following and the other guys can chip in with the rest.
The volume sliders on the i-30 r a great help in live situation where u can push up the drum or percussion track a bit to compensate for the acoustics/ sound system.
Not sure if the PA has the harmoniser for the main keyboard sound. Its there on the i-30 and is handy.
The touch screen is very comfortable to work with.
The backing sequence is great as well with copy measure and 5 extra tracks to sequence on.
One can jump from one arrangement to the other without stopping, in real time one can have the same style except one with different fill ins on two arrangements and then just hit the next arrangement button and u r into the next style without a jerk or anything.
I'm sure the other boards too have lots of good features and I'm looking forward to the mails from u guys.