Which one is more secure, PoW or PoS?

Before coming to an answer to this question, we need to understand the implications of security, what is necessary, how we can measure safety, and explore the pros and cons of both algorithms.

Initially, these concepts were created to mitigate denial of service attacks and spam by requiring that the network does some work. This work was usually performed by a computer, which processed empty data for a short period. Proof of Work and Proof of Stake are not all that different in anything except for the used resource.

That’s not to say that this difference is not important, not at all. It is significantly changing the entire system, especially when applied to blockchains and cryptocurrencies. So, they exist to mitigate attacks and spam, to make it expensive to try blocking or harming the network. Compared to biology, it’s like a Central Nervous System that facilitates an immune response, and you feel pain, thus moving away from the danger.Vice President of BTC.com, Alejandro de la Torre said during the panel discussion: “We all focus on the cool blockchain features, such as immutability, but we all forget that they come from Proof of Work. Just because you have SHA-256, that doesn’t necessarily mean your coin has enough mining power to maintain security.” As such, it is evident that smaller coins are at risk of being completely overtaken.