You mean because they're not symmetrical?
Most high end park skis are directional, look at the TW Jib, the AR7, the Scratch, the OMW, ect...they're all wider in the tip than the tail. This gives them a better carve off jumps and makes them more responsive when on edge. Does it make them better than symmetrical skis...not really, just different. Do they preform differently on edge, yeah, but they're both still designed to be park skis. Even though Presters are directional, they are still designed to be skied both forward and backwards. So will you notice a difference when riding switch on them than say the Filthy Rich, yeah, but not enough to make it difficult to ride switch, you'd just have to get used to it (something that will only take a few turns).