The Ortlieb mount is fine. If you're a tinkerer it's not a big deal to mount. Much easier than a fender IMO. If you haven't experienced the joy, uh "joy" of mounting accessoies on your bicycle then this might get you thinking about why things seem like such a patch and kludge job when it comes to bicycles.
The last time I mounted a Klickfix it was more of a pain then the Ortlieb. I had heckuva time trying to get the wire to thread through the clamps correctly.