Setting up the phone on the smaller one is kind of annoying with all the connecting and cables. The plus side is, if you're flying for fun, the smaller remote can be hooked up to an ipad or something. I think the pro is faster to get in the air with.
IIRC the Pro remote also has a LR pan function for the camera that the smaller one doesn't have.
IIRC the Pro remote also has a LR pan function for the camera that the smaller one doesn't have.