Which one is best in Laravel eloquent ? Relationship or Query builders leftjoin / join quires?

We are develop job portal website using Laravel Framework and MySQL here by the handle huge number of records( 1 million ). Now we can start the optimization process Laravel Model Query builder Model::join(contacts', 'users.id', '=', 'contacts.user_id')convert to eloquent relationships like belongsTo() and hasOne() and hasMany().

we need expert solutions... thanks in advance.

via Chebli Mohamed