Proof-of-stake (PoS) blockchains have numerous advantages over proof-of-work (PoW) blockchains as they are more environmentally friendly and have no centralization issues. However, there are also some disadvantages, such as double spending during blockchain reorganization.
To begin with, the PoS consensus mechanism is far more environmentally friendly than PoW. In essence, miners don't need to waste processing power on pointless calculations to safeguard the network.