Depends on what you mean by "better." Better for what? Kempo or kenpo usually refers to stand-up fighting with rapid, crisp series of punches, kicks, and other strikes. Jujutsu (there are various spellings) includes throws, chokes, joint locks, and ground fighing. There is considerable overlap in styles, but basically it depends on what you're looking to accomplish.
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That depends entirely on the context as a form of self defence Ju jitsu is highly effective due to it's grappling nature. That's not to say tae kwondo isn't good but it's pretty difficult to round house kick someone in the head if their climbing all over you.