It depends on what you are looking for. Tuesday is an early entry day. If you are not doing early entry, there will be a large number of people in the park before you arrive. The lines in Fantasyland, and parts of tomorrowland, will be long by time the park opens. If you only have one day to go, I would say Wednesday. If you have a multiday hopper and you are just deciding between those two days, my question would be- could you use EE on tuesday or are you using it a different day?