I have only been to FL once and only visited Disneyworld while there. This March I will be back in FL and I am interested in seeing Harry Potter and will have time to spend one day at Universal. Having never been to either park, is there enough to see at IOA in one day, or should I upgrade to the Park Hopper Ticket to go to USO also? Or is it too much to see in one day? Which park is considered to be the better park? Anything major will I miss if I skip USO and only go to IOA?