I've stayed at both and while both are very nice, I prefer the JW property. Pristine atmosphere, nice restaurants, etc. and the pools are excellent. If you have kids, they'll enjoy the lazy river. Bottom line is you can't go wrong with either but if you can save $100 a day, can't blame you for choosing the Casa. The good news is they are adjacent to one another and guests can use the services of either hotel (unless that has recently changed).