Congregations seeking to transform know there must be and work for unity between the clergy and laity. It is not possible for congregations to transform if the clergy are moving in one direction and the laity are moving in another direction in obvious competition.
So, who should lead? Please excuse the over simplistic answer, but God should lead. Neither the clergy or the laity leadership will be sufficient. They must together discern where God is in the process of leading the congregation, and then unite around aligning all that is done to move the congregation in that direction.