MSSQL still doesn't have replication on Linux. Here's one data scientists hillarious take on the difference between MSSQL and Postgres: https://www.pg-versus-ms.com/
I'm rather biased, I'll freely admit that. Having deployed some number of Django on PG solutions (some of which deliver moderate req/s) I will gravitate there just on experience alone.
I'm a big fan of PG and PG is good enough that it can compare favorably to MSSQL on its own merits, but that article reads more as a screed against commercial software than an objective assessment of PG's strengths relative to MSSQL. As an example, a big advantage of MSSQL for data analysis applications is its column store indexes which the author dismisses as something he doesn't use.
