Zero because it's a closed entropy permissioned ledger (just like all PoS coins), which means it's distributed but not decentralized, so it's technically more like a shareholder owned business. Except there are usually laws about trading shares of a company, so it's more like some type of illegal security (with a kinda flaky security model like all PoS systems). It really has nothing in common with Bitcoin at all. Even if you want a shareholder owned business and not a decentralized system, it's unable to scale to offer any commercial viability for it's services.
Federated chains are not decentralized either, but they usually have high performance. You have to take a hit in performance to move from federated to decentralized. Eth is neither federated or decentralized, so it has the cons of both systems and none of the benefits.
I think you should rethink a little more about security differences if it comes to POS/POW. There is literally no difference of buying half of the coins or half of the mining capacity if it comes to a coin with a high market cap. POS with forging is the equivalent to interest in your bank account and so its a good way to go...
Mining is perfect for a fair distribution method. Its also fine, if we find a way using the mining power for calculating useful things, but the waste of the SHA shit is for the ass...
