by 
sar
ANSWERS: 1
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None of them. None of them can handle gravity as defined by Einstein in general relativity so it is an incomplete theory. We would need a proper theory of Quantum Gravity first. String Theory offers hope but that is far from decided, string theory has never been experimentally verified nor, as far as I am aware, is there any prospect at this point of the theory making experimentally measurable predictions. I suspect, and hope, that this will soon be addressed. But for what it claims the various QM theories (not all that differnt fundamentally) are INCREDIBLY successful. And if we accept that QM is basically a correct hypothesis and we have just "missed a bit" then I would personally prefer the "Many Worlds" hypothesis. Or failing that David Bohm's ideas have great appeal, although I have a few issues with it.
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