> 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. >

> 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.