We use neither system in its pure form, yet we use elements of both. A congregational church is autonomous. The local body hires and terminates its pastor and all other personnel.
All ministries are strictly the responsibilities of the local church.
When a congregational church looks for a new pastor, they might send a search committee to listen to a minister they are interested in interviewing. A recommendation is made from the Pastoral Search Committee to the congregation and a congregational vote is taken for or against a candidate. Periodically, a vote of confidence is taken to determine if the pastor will continue his appointment at that church. That is how it works in a congregational system. But we don't operate that way.