The Custom Flying V is not really a park board. It's more of a do everything all over the mountain board. If you're looking for a park board in their lineup check out the Process Flying V, Parkitect, Joystick, Super Hero, or Whammy Bar. Nug wouldn't be a bad choice either.
As far as flying V vs. V rocker, the flying V probably offers more pop and stability for jumps while the v rocker would be slightly better on butters and rails. Depends on what kind of park riding you are trying to do.