How Does the ‘Economic Finality’ of PoS Compare to the ‘Probabilistic Finality’ of PoW?

PoW has 'probabilistic finality,' meaning a transaction is considered final with increasing certainty the more blocks are mined on top of it, but a reversal is always theoretically possible. PoS has 'economic finality,' meaning a transaction is irreversible once a supermajority of staked validators has attested to it.

Reversing it would require an attacker to destroy their own staked capital via slashing, making the attack economically non-viable and effectively final.