My opinion. We are Diamond+ on RCI, Elite+ on Celebrity, & top levels on other lines.
We don't cruise for perks as they are diminishing each year. There is no one cruise line that's the best. Each provide pluses & minuses.
A 3 or 4 day cruise is not a true cruise as you are getting on one day unpacking getting to dinner. The next day you have a day or 2. Then you are packing to go home.
Enjoy Cruising and try other lines to see different ships, entertainment, food, ports. A Crown Lounge with 4 drinks is not worth your time & money. JMHO