If a horcrux of Type 1 is found, that greatly increases the chance another horcrux of Type 1 is findable. You actually do want to use as many different modes as possible, not randomize across modes, because the probabilities are not independent.
Even so, I would think that having all of them off planet Earth would be preferable to some on it and some off. Inside the Sun, inside some of the ice-moons of the gas giants, and on various random trajectories out of the solar system (not strapped to a probe whose telemetry we know very well, for goodness' sake) would seem to be optimal. Of course this all depends on Voldy's actual ability to put them there.
Then there's the whole issue of traps/alarms. Trapping is probably not worthwhile if you're hiding in highly-inaccessible places, since if your e...
Update: This post has also been superseded - new comments belong in the latest thread.
The second thread has now also exceeded 500 comments, so after 42 chapters of MoR it's time for a new thread.
From the first thread: