With PoW you have miners vs whales.
With PoS... you have whales.
Nothing at Stake , the Biggest Lie out there.
Detail why it is a non-issue :
https://bitcointalksearch.org/topic/m.17135430
https://bitcointalksearch.org/topic/m.17136990
Summary:
Biggest Reason Nothing at Stake is a Lie,
It requires that the PoS Clients have the ability to Multistake as of this Point in Time, MultiStaking PoS Wallets do not exist!
Also anyone that believe the other part of the Nothing at stake Lie, that there are no additional resources required is a fool.
Additional CPU & Memory & Bandwidth would be required, the fact is Multistaking gains you Absolutly Nothing.
Example of a Multistaking wallet
Forks
2
4
8
16
32
64
128
256
512
1024
2048
4096
8192
16384
32768
That is only 15 blocks, it will draw more resources.
Fact of the matter it is alot easier to just place all of my coins in 1 block and stake the one block , it proof of hash will stop any coins from overwriting it.
proofhash< coinage * target
With Proof of Stake, multi-staking will gain you ZERO advantage over a Normal Staking Client.