Why do you prefer PostgreSQL RDS over Aurora RDS? Aurora seems better in every way but price[1]. (I know it also had some growing pains at launch.)
[1]: Amazon RDS for PostgreSQL is ideal when you have a small-to-medium intense workload. It works best when you have limited concurrent connections to your database. If you’re moving from commercial database engines such as Oracle or Microsoft SQL Server, Aurora PostgreSQL is a better choice because it provides matching performance with a lower price.
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