The OP won't know the answer to the question until he does some research and actually sails another cruise line. I like NCL for their relaxed attitude and dress, good entertainment and casino. I wasn't a great fan of their MDR, but NCL's specialty restaurants are good. But I also like MSC, Princess, Celebrity, RCCL's bigger ships and Carnival, which I've sailed on maybe 40 times?
I would say my fav line now is Celebrity, I have an 18 day B2b this Aug and a week in Jan 2023 booked. Their overall food is good, specialty restaurants are the best I've sampled on the mass cruise lines, over service is exemplary, their new ships are fantastic, and I've won a few jackpots in their casinos.
There really isnt much to lose in trying another line, I gave up top tier loyalty when I decided to try other lines, turns out the loyalty rewards (for me) were more of a ball and chain than a positive experience.