The Casino will probably sound louder when it is not plugged in, as it is an acoustic guitar. The Casino is a hollow body guitar and the Sheraton has a center block of wood down the middle of the body. Personally I like the sound of the P90s better, but that is a matter of taste.
The Casino has P90 pickups, the Sheraton has humbuckers. I've also never owned a Sheraton so I cannot give a direct comparison but they are two different guitars. The gold flakes off and looks pretty ratty after a while.
