Which is the best Carnival cruise ship?

[DominickRonan]

Hey, my family and I are going on a Carnival cruise over the Christmas break. I'm searching up which ship to go on. So far, i'm thinking about carnival imagination, because they have a perfect cruise for us, the 27th to the 31st. Is the fantasy class newer than the triumph class? I would like a cruse for 3-4 days, with carnival waterworks, and a jumbo LED screen. Is it possible for a ship to have those things and only be a 3-4 day cruise? Thanks.