What's the difference between 3D and 3D RPX?

The difference is the quality of sound and how the 3d comes at you. Its worth the $2 diffrence in price

RPX screen much bigger than IMAX

I have not a clue. I dont do 3D movies

I think RPX is a bigger screen. Certain auditoriums are designated RPX. RPX showings may or may not be 3D.

RPX os regal movie experience and the price is between standatd and 3D

Same movie experience non diff except the price of tickets