@Anoop

It depends on your requirement. Configuring deployment manager as the primary orchestrator is a straightforward task. But on using Jenkins you can streamline the process even more like devs can directly deploy from dev studio without using deployment manager, or if you're using automation testing then the test scripts can be automatically run on the target environment everytime a deployment happens to ensure robustness etc. But setting up Jenkins needs extra work. It ultimately depends what's your requirement and how your deployment cycle is setup. You can get more information on Jenkins here.