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RobbBB comments on Many Worlds, One Best Guess - Less Wrong
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Mitchell,
there is another argument speaking for many-worlds (indeed, even for all possible worlds - which raises new interesting questions of what is possible of course - certainly not everything that is imaginable): that to specify one universe with many random events requires lots of information, while if _everything_ exists the information content is zero - which fits nicely with ex nihilo nihil fit :-)
Structure and concreteness only emerges from the inside view, which gives the picture of a single world. Max Tegmark has paraphrased this idea nicely with the quip "many words or many worlds" (words standing for high information content).
Max's paper is quite illuminating: Tegmark, Max. 2007. The Mathematical Universe http://arxiv.org/abs/0704.0646
So we could say that there a good metaphysical reasons for preferring MWI to GRW or Bohm.
But MWI is not the doctrine 'everything exists'. This is a change of topic. Yes, if we live in a Tegmark universe and MWI is the simplest theory, then it's likely we live in one of the MWI-following parts of the universe. But if we don't live in a Tegmark universe and MWI is the simplest theory, then it's still likely we live in one of the MWI-following possible worlds. It seems to me that all the work is being done by Ockham, not by Tegmark.