This is an example of bind vs self scoping. Which do you prefer?

bind vs. scoping self

init: function () {
    setInterval(function () {
      ajax('/last-modified', {
        cache: false
      }).then(function (data) {
        if (moment(this.get('date')).isBefore(data.modified)) {
          this.set('appUpdated', true);
        }
      }.bind(this), function (e) {
        //console.log(e);
      }.bind(this));
    }.bind(this), (this.get('seconds') * 1000));
  }
  
  
init: function () {
    var self = this;
    setInterval(function () {
      ajax('/last-modified', {
        cache: false
      }).then(function (data) {
        if (moment(self.get('date')).isBefore(data.modified)) {
          self.set('appUpdated', true);
        }
      }, function (e) {
        //console.log(e);
      });
    }, (self.get('seconds') * 1000));
  }