PoW pros:

• meritocracy is the most ethical monetary and governance policy
• creates economic incentive to run nodes, which secure the network
• creates a sunken cost for tokens
• is decentralizing in nature

PoW cons:

• can consume a significant carbon footprint
• PoW slows down the network

PoS pros:

• has smaller carbon footprint
• can process more transactions than PoW

PoS cons:

• PoS plutocracy monetary and governance policy is unethical, especially when the token was premined and handed to insiders
• no incentive to run nodes, compromises the security of the network
• no sunken cost for tokens
• is centralizing in nature

I think the biggest con of PoS is the lack of incentive to run a node. It's human nature not care about security until something bad happens, and I fear that eventually Ethereum will face a byzantine generals crisis due to a lack of nodes. While PoW isn't perfect, it was engineered as a solution to the game theory problems of PoS.