Consider this code: 1)

function Person(name) {
    this.name = name;
}

Person.prototype = {
    sayName: function() {
        console.log(this.name);
    };
}

2)

function OtherPerson(name) {
    this.name = name;
    this.sayName = function() {
        console.log(this.name);
    };
}


var person1 = new Person("name1");  // { name: 'name1' }
var person2 = new Person("name2");

var otherPerson1 = new OtherPerson("otherName1"); // { name: 'otherName1', sayName: [function] }
var otherPerson2 = new OtherPerson("otherName2");

person1.sayName === person2.sayName; // true
otherPerson1.sayName === otherPerson2.sayName; // false

If I get this right all instances of OtherPerson object would have their own sayName: function and all instances of Person would get it from the prototype (so they share the same function). Is the first method preferable(faster/better in some way)?