The Remora uses spray injection for bubble production. There is no venturi to clog and no air adjustment to fool with. The Remora also uses a MJ1200 pump (providing you order it) which is one of the most reliable powerheads available. The only adjustment on the Remora is the height of the collection cup which makes it very user friendly.
The Prizm has a pump that leaves something to be desired...it loses its prime very easily. Although there is no adjustment for airflow, you have to adjust the water flow on the Prizm and this is a tricky process that has to be done often. The collection cup on the Prizm uses an O ring for a seal and it's prone to leak. If you set your water flow too high, it WILL leak. The Prizm Pro is pretty much a larger version of the Prizm with the primary difference being that it will put more water in your floor faster than the regular Prizm.