Arthur:
I've cruised Seabourn and loved it, but their itineraries haven't fit our schedule so we tried Radisson's Mariner last fall. We found the food wonderful and really enjoyed the choices in dining venues - more options than Seabourn.
Don't get me wrong - each lines has it's pros and cons. Sometimes it's a compromise.
I think RSSC is worth the risk of trying. We booked our second cruise within 30 days!