Belle's times are normally:
11:00am, 12pm, 1pm, 2:50pm, 3:50pm, 4:50pm
Aurora:
12:30pm, 1:30pm, 2:30pm, 4:20pm, 5:20pm, 6:20pm
If you wish to see Belle, I would recommend the 11:00am meet. Plan to get there for around 10:40/10:45am.
Aurora doesn't usually have longer lines, but I would recommend meeting her at MK as her waits there have been minimal, as she's tucked away to the left of the entrance by Guest Relations.