I think Java is bigger in terms of the amount of classes/methods that there are to remember. Perhaps I compare them unfairly because I consider everything in the SDK to be a part of Java, whereas the things people might usually bundle in JS (JQuery, etc) I don't consider part of JS because you have to go out and get them separately. I didn't mean bigger in the sense that you need to know more to be able to use it, I meant it in the sense that it is a larger API.