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Here's some discussion from when Uber switched back from PostgreSQL to MySQL:

https://news.ycombinator.com/item?id=12166585

FWIW I prefer PostgreSQL.

The linked article is a good dive into the internals of Postgres vs MySQL.

However, Uber didn't really switch from Postgres to MySQL, they switched from Postgres to their home rolled document database which uses MySQL as the storage layer. [1]

[1] https://eng.uber.com/schemaless-part-one/

Markus Winand's write-up at https://use-the-index-luke.com/blog/2016-07-29/on-ubers-choi... really drives this point home. InnoDB has favorable characteristics for what they're trying to do.

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