*snipped*

In PoS, it isn't the majority that decides, it's the majority stakeholder entity which once appeared can't be erased from history. Once the majority condition has been achieved ONCE, it will be available as an attack vector FOREVER. In PoW, a majority condition achieved ONCE will provide temporary reversible benefits and is very easy to spot and eliminate.

The cost to fork and keep up a hidden PoS blockchain is less than 5 USD a month for ANY coin.
The cost to fork and keep up a hidden PoW bitcoin blockchain is 30000000 USD a month.

Do you still need to compare the two?

*blahblah snipped*