For what it's worth, we had a Cat 9 and thought it was great. We had no problems with our location. It might have been nice to just hop up the stairs to the buffet in the morning, but on Deck 2, we never had a problem with the elevators being full when they came for us
Also, looking out the porthole, it seemed like we were near the water... like being on a sailboat looking out over the water. I know from Deck 9, you could tell you were pretty high above the water.
Just an FYI, but the Cat. 9's on Deck 1 have two small portholes as compared to the one very large porthole in the others. I'd definitely go with the larger porthole. Other than that I'd say save the $100 and book the 9.
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