MySQL has had replication for _longer_, but I would the MySQL team has a history of releasing half-baked functionality with a long list of gotchas. PostgreSQL has only had replication in the core product for the past couple of versions, previously you had to rely on third party tools which had some interesting behaviours, or that were entirely commercial.

Since PostgreSQL 10 WAL and logical replication strategies can support just about any sort of replication you desire, except multi-master.