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I'm intrigued by both methods of proof but I must admit that I don't know enough to produce a well informed response. My understanding is that POS is more energy efficient than POW while others have argued that POS could create a "feudal like" system. What are your thoughts?

Feudal System, I don't think so, because today the POW is almost doing it, since the price of GPU cards is going up and rising. Here in Brazil a RX580 8 gb is almost 2.5k reais or 760 dollars, that is expensive for majority of people.
You could have a good portion of coins with that investment, like SYNX, PIVX or BITB.
Also, the POS system is more scalable than POW, but I am on both sides... I have a miner with r9 380 bought before the prices rise and also a few coins staking.
I think this theme could create a amazing post about it.

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