在角度组件中使用$ onChanges vs $ onInit

使用Controller1vs 之间有区别Controller2吗？

angular.module('app', [])
.component('foo', {
    templateUrl: 'foo.html',
    bindings: {
        user: '<',
    },
    controller: Controller1, //Or Controller2
});

function Controller1(){
    this.$onInit = function(){
      this.user = angular.copy(this.user);
    };

    this.$onChanges = function(changes){
      if(changes.user && !changes.user.isFirstChange()){
        this.user = angular.copy(changes.user.currentValue);
      }
    };
}


function Controller2(){
    this.$onChanges = function(changes){
      if(changes.user){
        this.user = angular.copy(changes.user.currentValue);
      }
    };
}