Each person has different tastes, but for my wife and I Celebrity is the way to go. You have to experience the Celebrity touches to appreciate them. I have been on Celebrity 7 times and twice on Carnival, and I certainly recommend Celebrity.
Carnival Liberty New Year's Eve 2007
Liberty of the Seas 5/2008+11/2009
Allure 1/16/ 2011
Vision OTS 2-14-2015
Freedom OTS 3/6/16