From AAA, a 4-day Park Hopper was cheaper than a 4-day MYW with the park hopping option. I realize you get more bang for your buck by buying a 10 day MYW with park hopping and no expiration, but we couldn't spare the extra expense right now, and don't have any WDW trips planned in the near future, so the old park hopper was really the most economical option for us.