Proof of Work algorithm is currently the most safest consensus what we have. I do not understand the hype around Proof of Stake - have you thought about the problem of PoS consensus? When you find out a bug in a protocol, you can easily destroy the whole history of the blockchain in few seconds!
but POW has already been hacked by 51% attack many times and we all have seen how the double spending of coins happened. there is nothing really safety in the cryptocurrency. hackers will always find problem areas in the blockchain and algorithms