When you say 4 days this june does that mean a 4 day trip or your sure you will go into parks 4 days. Because you might only feel like going 3 times. The 10 day pass give you that option not to go.
I bought a 7 day pass in 2003 with 4 waterpark / PI options on it B4 the new park pass structure . I still have 2 Park and 2 options days left on it, and it has already covered 2, 6 night vacations.
Also by banking and borrowing and a little planing I managed to stay in Disney World 29 night over a 365 day period that ended last summer. For that I bought all the family an AP without waterpark option. And man did Iwe ever use it. The AP comes in real handy if your doing the Dinning Plan. I mean you would hate to burn a park day just for a dinner at Epcot. With AP no problem. With your 10day pass a little more planning involved.
But if you have the 10day no expire pass I count the options as a day because the waterparks wear me out, its a day in itself. So You get what is it 5 options so to me thats 5 more days of fun. so your 10 day pass is now really a 15 day pass. Just a little food for thought.