Of course you should try other lines! 🙂 I've been on about 15 Carnival, but I've been on a few NCL, Princess and just recently 4 RCL cruises including their newest Wonder of the Seas. I find the differences between them all to not be very significant, and I always come back to Carnival being my favorite cruise line of those 4. On my list, I put Princess 2nd, RCL 3rd and NCL 4th. Just my humble opinion, that I've based on Food, Service and entertainment. Variety is good, so go for it!!! I'm sure you'll find things you like on all of the different lines. I've never had a bad cruise!