We were on the Ryndam as well as the Oosterdam. Both were nice ships. The O goes on 7 day cruises, and the ports are always Cabo, Mazatlan, and Puerto Vallarta. The Ryndam's itinery sometimes has different Mexican ports and sometimes longer cruising. I prefer the newer and larger O. The O has the most comfortable beds we ever experienced at sea. Don't know if the Ryndam has that change yet.The bigger ships have much larger public rooms so never feel crowded. The food and entertainment on the O was the best.
Just got off the cruise yesterday.
Have fun whatever you chose. We have never had a bad cruise and we have cruised over 40 times.