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A single point for Mongo over Postgre JsonB is WiredTiger is very good at compression. In times of Mongo:4.0 vs Postgre:10.5 it was like 20Gb vs 50Gb. Though could depend on documents structure. Not sure about current state. Querries were also somewhat faster in Mongo.

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> A single point for Mongo over Postgre JsonB is WiredTiger is very good at compression

Granted, the compression story in postgres isn't currently amazing.

> Querries were also somewhat faster in Mongo.

If you really want fast queries it's not super hard to tune postgres to be fast and drop data if it crashes. It's a bit trickier to tune it to be quite that fast if you want to keep all your data, but for a single table of json documents it should be doable if you're okay with not having transactions.

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