Electrical is worse, by far. Plumbing can usually be remedied pretty quickly, and quite inexpensively. Many times you can just pour powerful chemicals down the pipes and voila! When it comes to electrical problems, most of the time you can't determine the problem until you start replacing things in a trial error-like fashion, in hopes you'll figure out the problem before replacing every component in the system. When it comes to electrical issues, often you won't know what the problem is until you've already fixed it.