How Does the Capital Cost of a PoS Attack Compare to the Operational Cost of a PoW Attack?

A PoS attack requires a large, upfront capital cost to acquire the necessary majority of the staked coin supply. A PoW attack primarily involves an operational cost (rental fees, electricity) to acquire temporary hashrate.

The PoS attacker's capital is at risk of being slashed, making the potential loss significantly higher than the rental cost of a PoW attack.