I definitely think that ZK rollups are better if possible for the reasons you mention!
The challenge with ZK rollups is that at present they’re not capable of supporting general-purpose EVM computation (though that may soon change, see Starkware’s efforts!), so at present we have to work with the optimistic variety. And the optimistic constructions are not that bad IMO; they suffer from some of the drawbacks of plasma, but not all; in particular, unlike plasma, optimistic rollups are easily extensible to generic EVM applications, which makes them much more suited to “scaling ethereum” generally, whereas plasma is only effective for payments, DEX and a few other use cases.