The cat 9's on deck 1 have the two smaller portholes, the ones on Deck 2 have the large single porthole.
I stayed on Deck 1 and thought I would not like it, but ended up liking it very much and I would not hesitate to stay there again. It was so convenient for getting on and off the ship for shore excursions. Staying on Deck 2 this time so I can compare decks.
MJ