The MYW one's are a bit complex, there are so many different types, 5, 7, 10 days etc
Often Universal have offers on which means you can get a free day etc
Don't disagree on the 10 MYW but I would compare the cost of the US/ioa +BG+SW against a 5 Park flex (www.attractionticketsdirect.co.uk) although you won't use the WnW bit it's still good value for repeat trips to the other parks for 14 days
HTH SD