Nintendo world or Disney SeaWorld?

I'm going to be in Japan for two weeks, so I want to go to at least one Japanese theme park. I'll be jumping between Tokyo, Osaka, Kyoto, and then back to Tokyo, as well as some day trips to places like Nara, etc. So I think I can squeeze in a day to a theme park. And the real question is, what's better, Nintendo World or Disney Sea World? Or are there some other theme parks that are even better? I mean, in my current stage of life as an adult, I interact with neither Nintendo nor Disney very much at all. But I loved Nintendo as a kid, and sometimes played Kirby with my sister. So Nintendo World sounds pretty cool in Japanese. Disney World is just Disney World. So what really matters to me is what is the better theme park, not counting any attachment to the actual intellectual property. This is me and my girlfriend going. What do you guys recommend?