[fsewe20]

Vitaliks recent blog post is probably the best place for a quick overview of Pos/PoW attack costs and why PoS looks to be a more secure approach https://vitalik.ca/general/2020/11/06/pos2020.html

[ece]

I think PoS is much more likely to get wider adoption than PoW with the rest of the Ethereum ecosystem, FWIW. Glad Ethereum is making the switch.