Which ship are you looking at? I see the Carnival Destiny sailing a five night Western Caribbean on 10/22, the Carnival Liberty sailing a seven night Western Caribbean on 10/22, and the Norwegian Pearl on 10/23 sailing a seven night Western Caribbean. There is also a five night Western Caribbean sailing on Celebrity's Millennium on 10/22.

Of these four (and I've been on all of them), I would rate them in the following order:

Millennium
Pearl
Liberty
Destiny