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We've been on sister ships of the ones you're considering: Mercury and Golden P. We like Celebrity (going our 7th cruise with them next month), but think Princess has some advantage, as well. While I prefer the food on Celebrity, the personal choice dining option on Princess is mighty appealing and we enjoyed it on the Golden. Size-wise, I don't think you'll notice the difference. We were on the Golden during its Thanksgiving week cruise and it was at max. capacity. Given that, plus 3 sea days with all those folks, there really wasn't a feeling of being too crowded. In fact, I felt much more crowded in the Horizon in Jan. in the "Lido" buffet area. I think Princess offers more entertainment options at night, often having a big show in the theater, as well as a comedian or something in the largest lounge.
