Actually the room sizes themselves are exactly the same.
The differences are: the deluxes are top floor, the standards are bottom floor. The bathrooms in the deluxes are twice as large than the standards and have an additional shower (for a total of 2) plus the indoor tub has jacuzzi jets, the standard tub does not. Both have the jacuzzi's on the balcony.
I've stayed in both and preferred the deluxe's , mainly for the 2nd story being a little more private. In the standard rooms there are walkways right underneath the balconies so although I could barely see the tops of their heads, I always knew when people were walking by.