Cryptographically, PoW is pure BS as a protection. Any digital signature beats it with tens of orders of magnitude in "efficiency" (that is, spent resources versus security obtained).
Who's 'Efficient' Digital signature am I supposed to be trusting ?
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POW is Objective. POS is not.
POW accumulates over time. POS does not. ( I can fake POS history using old spent keys )
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Sure - POW has issues in this current user/miner implementation (I would prefer the users to mine their own txns..), but POS doesn't currently work (and may never fully work) or any one of the uber geniuses working on it would have come up with a viable algorithm by now..
