tough call.
While I can't speak to the actual production of either, Carousel is the superior show. It's also not done a tremendous amount, while OOTI has local productions all the time. (Sure, not of the same caliber..but still.)
However, you also have to consider your tastes. Do you like serious themes? Do you prefer your musicals to be toe tapping and uplifting? They are so different, the choice has little to do with one being BETTER than the other.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.