Being an Oracle shop using Oracle Database and MySQL, management console from Oracle was a better choice than IBM or Microsoft even though we do use Microsoft Azure and storage/servers from IBM (on-prem).
OEM Cloud Control base version is free to use if you have licensed Enterprise Edition of one of the Oracle Product. It's sophisticated single point of control, we have used other monitoring products such as Veeam but none of the products have all the features packed together like OEM Cloud Control does.
Since OEM Cloud Control comes free with Enterprise Edition, we have mostly worked on OEM Cloud Control. I did have my fair share of experience with DBArtisan. It's good and lighter than OEM Cloud Control. It sort of removes your need to even go to SQLPLUS command line most of the time. But it is way behind OEM Cloud Control in terms of features.
Oracle Enterprise Manager is Oracle’s on-premise management platform
that provides a single dashboard to manage all Oracle
deployments, in the data center or in the cloud. Through deep
integration with Oracle’s product stack, it provides management and automation support for Oracle applications, databases,
middleware, hardware, and engineered systems.