I'm not a fan of gold hardware either. The gold flakes off and looks pretty ratty after a while.
I've also never owned a Sheraton so I cannot give a direct comparison but they are two different guitars.
The Casino has P90 pickups, the Sheraton has humbuckers. The sound is different. Personally I like the sound of the P90s better, but that is a matter of taste.
The Casino is a hollow body guitar and the Sheraton has a center block of wood down the middle of the body. This affects the sound. Again, it is a matter of taste.
The Casino will probably sound louder when it is not plugged in, as it is an acoustic guitar. Supposedly the block of wood down the middle will give the Sherry more sustain, but since I don't own both, I cannot verify that (perhaps someone who owns both can help here).
Also, the Casino is probably lighter.
But the Sherry has a much nicer looking headstock.
My advice is to try to find a music store that has both and try them out. Plug them in, set the volume and tone controls the same and listen to them both. Then change the tone controls and listen again.
If the store has a Casino and not Sheraton, but has a Dot or Gibson ES335, you can listen to the Dot or 335 in place of the Sherry and get an idea of how they will sound. Since they have similar body styles and pickups they will sound about as close as you can get (please correct me if I'm wrong here).
I know that buying an unknown entity is taking a bit of a chance. If you have a local guitar store, that is the best way to continue your research.
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