Great question! Mechanically and electronically these are the same bike, however, the Ripcurrent series will also have a more upright handlebar set up. Ripcurrent series are great for on and off-road fun and are very comfortable.
The Crosscurrent series are ideal for long-distance commuters looking for a lighter more efficient ride. The Crosscurrent series are designed with paved scenarios in mind. These will have a straight mountain bike style handlebar and have a more aggressive riding position. Compare the two models here.