I am considering the purchase of either a Sansamp Para Driver (floor pedal) vs. RPM (rack mount) for bass.

I know the RPM has more interface and connection options since it is bigger and has the rack mount chassis - other than this is there any different in sound? Has anyone used both?

The Para Driver is about $120 USD cheaper - if it has the same capabilities with sound, and if I don't need the extra interfaces, then it would seem like a better buy.