Jiu Jitsu satisfies my need to manage my aggression in a controlled manner.
Aikido satisfies my need to calm and soften my thoughts while still maintaining a control.
I think there is a need for both, depending on events which are happening in your life. You cannot walk around in a permanent state of anger, but you cannot always be passive. A time to be calm, a time to be strident.
It’s not very profound, but it explains to me why I like practicing both.