In general, I would suggest that a brand new file system, even when tested, is going to be much much riskier than one with the years of refinement HFS+ has.
By that I don't mean to suggest HFS+ is perfect. Just that APFS isn't going to be mature for a while, and I'd probably leave it to the "pioneers" (the ones with the arrows in them) to work with it for a while...
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--Dave Nanian
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