It's the same..... IMO it's better to just buy it on board, full of beer, then to have to wait for your room to be ready and then carry it to lunch or dinner
What I would add is that the one time I preordered they actually ran out onboard and so having a preorder was the only way you could guarantee you have one. This was on a WBTA as they had run out in Europe. This is rare though but something to think about.
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