as for me i was not think that pos is better then pow, but lastly i read i article from vitalic the co-founder of eth about why pos is better then pow, which his article was not really neutral , but it made me re-think about pos and starting researching and discovered that attacking pos with 51% attack is hard like attacking pow, and pos have super less energy consumption add to that they will make eth 2.0 can handle more transaction for next generation.
Why do many famous coins use the POW algorithm? This algorithm has many drawbacks (for example, a 51% attack, as happened with coins such as ETC).
But this algorithm has one big plus - decentralization.
I have not yet seen coins on the POS algorithm that can be called centralized, because most of the validator nodes belong to developers or large investors.
Ethereum currently has the best implementation of a decentralized protocol based on the POS algorithm.