I have tried Carnival twice, but once I went on Royal there in no way that I"m going back to Carnival.
I have really enjoyed all three of my cruises on Royal.
My 4th one will be on the Allure OTS on 1-16-2010.
Carnival Liberty New Year's Eve 2007
Liberty of the Seas 5/2008+11/2009
Allure 1/16/ 2011
Independence of the Seas 12/29/2013 Top-notch!