managed vs unmanaged

Apart from you having more controls over the configuration of the nodes, which can be required if your company mandates some specific rules, there is none. It will require you to do all the heavy lifting yourself.

https://repost.aws/questions/QU3b7kgBtFSCGtWW88a3fiMQ/difference-between-eks-managed-node-group-and-self-managed-node-group