Taper wings, as a 'rule of thumb' have a tendency to tip stall easier, where constant cord does not tip stall, 'rule of thumb'. Tip stalling the wing will allow the aircraft to perfrom snaps quicker though have some other characteristics that you don't necessarily want. With a constant cord wing design, you want allot of drag on the wing with a Fun-Fly. A thick foil with a blunt leading edge will allow the wing to stall for flips, i.e. snaps. Both a constant cord and a tapered wing has their advantages and disadvantages when it comes to Fun-Flys. It depends on what flight characteristics that you want. 'You can't have your cake and eat it too!'
You just need to fly both and decide what you prefer.