I did the cave tubing during the time Carnival was not offering it and was completely satisfied with Major Tom. I have not personally heard of anyone dissatisfied with Yhonny. Whichever one of the three you choose it is the same tubing ride. The only difference will be the guides and which bus you ride. This is a must do excursion.
50 Carnival: Mardi Gras, Ecstasy X2, Fascination X6, Celebration, Elation X5, Glory X4, Fantasy X4, Valor, Holiday X3, Imagination, Liberty, Spirit X2, Freedom, Destiny X2, Splendor X2, Dream X2, Conquest, Legend X2, Victory, Sensation, Paradise, Inspiration, Magic X2, Triumph, Miracle, Breeze
5 Norwegian: Sky, Jewel, Dawn, Epic, Pearl
6 Windjammer: S/V Legacy X3, S/V Polynesia, S/V Caledonia, S/V Diamant