Perhaps proof of stake is not better, but worse. It's not good if a coin is not neutral (Bitcoin is neutral, not controlled by anybody), but Ethereum and Cardano have businessmen behind them. The more coins they have, the more they control the market and the outcome of the price. My personal opinion is that all these other coins are controlled from behind, which means that's equal to centralization. Bitcoin is the only major independent one. I also think that many of these crypto crashes are due to the massive profit-taking sales that "hodlers" make. They pump up the price and the hole thing goes down. Ethereum starts to stink. And there are tentacles that are trying to control it from outside as well: