Over the past few years, we have cruised with Princess and Celebrity. In the past, I would choose based on itinerary and price.
A funny thing happened on the way to the forum :). Last November, we were taking my wife's sister and brother in law on a Princess cruise. They canceled at the last minute so we lost a bit of money on their deposit and flight. We opted to upgrade our balcony to a suite since we already expected to spend that amount of money. It is a funny thing about cruising. Every time you move up a stateroom class, it is difficult to go backwards.
We opted to go with the Celebrity Suite on this cruise. Was it expensive? Yes, but we saw value in this selection. I get some of the readers may say less is more and I get it but we were celebrating my wife's birthday and this was beyond special.
Amazing - Large room and balcony (around 500 square total). Separate sitting area with door (not curtain). Full size bath with amazing shower head and 1/2 glass door / 1/2 curtain. Butler attended to our needs along with stateroom attendant. Large walk in closet and amazing bed. Two large TVs but not necessary but nice to have in the background.
Really nice tour of the island and of course the Curacao plant.