Any day besides Thanksgiving week.
Since thier annual passes are cheaper than Disney, I would think there's bit more local crowd on the weekends, especially since school started. But I usually only go Tues/Wens so I don't know about the rest of the week.
Especially in Orlando with so many travelers, there's no one particular day that's busier than the rest. Like local parks in small areas that don't have the number of tourist we do I'm sure there's a major difference between week days and weekends.
Disney's influx on park attendance can happen because of EMH, but none of the other parks have that, so there's nothing to influence it.