What is the difference between Aurora Mysql 5.7.x and Aurora 2.x.x I have an RDS instance with Aurora Mysql 5.7.12 and I noticed that there are other versions of Aurora Mysql 5.7, but I don't understand what is the difference between them. 

Some of the version listed are: 


Aurora (MySQL)-5.7.12   &lt;- The one that I have.
Aurora (MySQL 5.7)-2.03.2
Aurora (MySQL 5.7)-2.03.3
Aurora (MySQL 5.7)-2.03.4
Aurora (MySQL 5.7)-2.04.1
Etc...


I attach an image of the AWS Console:

I want to chose the right version (the one that have most bug fixes in order to have better stability in my system).
They're differences in the minor/patch versions of Aurora.
If you spin up an instance of Aurora (MySQL)-5.7.12, then run:
SELECT @@aurora_version; -- Returns 2.02.5

It's essentially the first version of MySQL 5.7 compatible Aurora.
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraMySQL.Updates.html