I’ve only done mermaid once but do nemo at least once each trip. It’s not the greatest ride but was my nephews favorite his first time there so we enjoy it. And I know that movie so I do like it. I liked mermaid when I rode it but never saw the movie and never make a point of going on it (but wouldn’t mind either). Nemo also never has much of a wait when we go on it. I wouldn’t wait more than about 20 minutes for either.