They're both good and bad. PoW makes it easier to centralize mining power, so it can be a lot less efficient as a sybil protection measure but PoS faces a similar problem as well. PoS can be good if the team holds none of their own tokens, or nearly none(which is never or almost never that case with these projects as most of them are simply pump and dump money makers for the teams). And as long as the tokens are well distributed without a large concentration of tokens in one wallet. They can both be relatively power efficient depending on the consensus algorithm used, but PoS has an advantage in general.