Explain the Difference between MEV in Proof-of-Work (PoW) and Proof-of-Stake (PoS) Consensus Mechanisms

In PoW, MEV is extracted by miners who order transactions within the block they are mining. In PoS, MEV is extracted by validators who are responsible for proposing and attesting to new blocks.

While the actors differ (miners vs. validators), the underlying principle of extracting value through transaction ordering remains the same. PoS introduces new MEV vectors related to validator staking and delegation, but the core front-running mechanism is similar.