Assuming you mean Carnival Liberty and not Liberty of the Seas, then I would say that Liberty has the edge over Victory. BUT, not by much... I would let the cruise itinerary make the choice. GO on the ship that has the better cruise. If those are equal.. go with CCL Liberty.
I have been on both, pretty much only the decor is the big difference, I enjoy Karaoke and the Liberty has it out doors on the huge Jumbotron Screen.I would base it on the Ports. I'm on the Liberty sailing 4 Aug 07 comme on
Depends what do you expect to find,if you look for new...C.Liberty,if you look for smaller get C.Victory.However inside they are prety much the same(information deck 3,shops,disco,coffe-shop,casino deck 4,pool deck 9...)..one deck extra and almost 300 passengers more on first one!
If I was u i was look up on itinerary!
Anyway have fun!