Proof of Work (PoW) is the most utilized system of all. Since 2009 it has officially demonstrated its strength and security. In Proof of Work mechanism, computers in the network / miners work to solve a cryptographic puzzle repetitively consisting of the mathematical function /hash.
POS miners came together to ensure that no one losses their money in Ponzi schemes online. The directors of this company have a good experience and this is the one thing that they ensure won’t happen in POS.