Tia and Al, I have been on two SS cruises. One in the Caribbean and one in the Med. I did notice that there were many more tuxes on our Med cruise, with only a small % opting for dark suits. As far as being a quiter crowd. I don' think that was the case, but then maybe I am the loud one. LOL
I think SS is very similar to RSSC, with the exception that drinks are included all the time throughout the ship. I think you will really enjoy it. Have a great cruise.