Disneyland I would say the park hopper and you can do it all in a day, but you can also spend all day at Disney and go the next day to California adventure. They allow you to use the ticket of the park you haven't seen up to six days from purchase.
If you go to Disney World you need about 4 days and just get afford a ticket if you go to Disneyland then you'll be there for about 2 days and get a 2-day ticket
Not sure what ticket but you need 5 days to see everything
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