Hi @gon_detechai ,
Since Qovery provides you the ability to choose between a container (Redis in a container) and managed (AWS ElasticCache) instance, you will need to take a look at ElasticCache vs Redis differences directly.
If you are talking about the difference between managing ElastiCache via Qovery or not, then there is no difference with AWS ElastiCache. You just keep things simple regarding management on Qovery, especially if you are using multiple environments. Qovery will take care of well configuring your ElastiCache instance in the appropriate VPC, with the right security parameters and the right options to make it accessible from your applications.
Let me know if you need more clarifications