On our tour we were able to get a lot closer to a dolphin pod that swam right along the boat and they did go into a cave which was cool. The snorkeling was ok, but not the highlight of the tour.

The zodiak was pretty rough, especially on the way back where we were jumping waves and rough water, I loved it, but my wife would probably choose the cat if we did it again, she and another person got pretty seasick the other 12 or so were fine.

If you want a more relaxed/smooth tour, take the cat, but if you want a more active tour take the zodiac.