The Restaurant is smaller on the Expedition ships and the WC is much larger (we never had any issue finding a nice table for breakfast, lunch or dinner) and has a much wider selection and cooked to order items at the Grill within the WC, including steaks, lobster tails, etc. Our experience was after placing your order at the grill, a server would ask where we were sitting and would deliver our food to the table. We found the WC to be a very good dining experience despite our usual preference for a table service venue. There is also a dedicated cold seafood area with a great selection of crab legs, shrimp, mussels, etc. and a large made to order sushi area. We had no problems getting reservations at the Restaurant or Manfredi's on any evening we wanted, at times as late as 5:00pm the day of. After the first day or so, I noticed that pax were gravitating to the WC due to the flexibility, quality and selection.
There is Manfredi's on the Expedition ships, just no Chef's table.