At the company I work for we are currently in the process of migrating from MSSQL to PostgreSQL. However, we are trickling to a full stack switch to Linux. In the meantime, the Postgres databases have performed extremely well and on balance we are happy with it.

Unfortunately I would argue that at an enterprise level MSSQL is better than Postgres (pure conjecture here). If nothing else, it is way easier to employ MSSQL experts where I live and next to impossible to find Postgres talent. This pretty much means that we are learning by trial and error what the best practices are.