> There's an abundance of benchmarks showing Aurora is better in terms of performance but they leave out so much about their RDS config that I'm having a hard time believing them.

Do you have a problem believing these claims on equivalent hardware?: https://pages.cs.wisc.edu/~yxy/cs764-f20/papers/aurora-sigmo...

Or do your own performance assessments, following the published document and templates available so you can find the facts on your own?

For Aurora MySql:

"Amazon Aurora Performance Assessment Technical Guide" - https://d1.awsstatic.com/product-marketing/Aurora/RDS_Aurora...

For Aurora Postgres:

"...Steps to benchmark the performance of the PostgreSQL-compatible edition of Amazon Aurora using the pgbench and sysbench benchmarking tools..." - https://d1.awsstatic.com/product-marketing/Aurora/RDS_Aurora...

"Automate benchmark tests for Amazon Aurora PostgreSQL" - https://aws.amazon.com/blogs/database/automate-benchmark-tes...

"Benchmarking Amazon Aurora Limitless with pgbench" - https://aws.amazon.com/blogs/database/benchmarking-amazon-au...