Reading you, I have the feeling that you are booked in Y and that you are proposed a paid upgrade for W ? If yes, keep in mind that the proposal may disappear at any minute if other pax are taking it. So if that's what you want, you should hurry up to take it. Back to your question, if this is a night flight, I would take the Seat+ in Y. On a day flight, W would have been much better.