Congratulations on your upcoming nuptials.
Freedom and Valor are Conquest class ships while Legend and Pride are Spirit class ships. The two classes of ships are configured somewhat differently but you should find the activities on board to be pretty much the same. Of the four Freedom is the newest ship (I think). None of them are exactly a bucket of bolts.
While we might debate on this board whether we prefer Spirit or Conquest class, I'm sure you will enjoy a cruise on any of them.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014, Regal 2014