Cousins-My girl and I have many years of cruising,we have cruised many cruise lines,some of which no longer exist and the ships are long gone. Currently we are enamored with the newest ships of NCL with their more "laid back" options and the variety of culinary delights. However, we enjoy cruising period! We have done CCL starting with the Mardi Gras,We have done Cunard aboard the QM when she was still crossing the Atlantic (ages 7 & 8-we're not that old!).
Yes, we have cruised these lines before but we do not necessarily really favor one over the other-more often it is the ship itself and the cruise destinations that help us decide with final cost always an overiding factor!
Hope this answers your question!