what's faster for uniqueness in an array

reduce operation benchmark.js

require('babel-polyfill');
var uuid = require('uuid');
var faker = require('faker');
var Benchmark = require('benchmark');
var suite = new Benchmark.Suite;
var chunkify = require('chunkify');

const createFakeArray = range => {
  const arr = [];
  for (let i = 0; i < range; i ++) {
    arr.push({
      fName: faker.name.firstName(),
      lName: faker.name.lastName(),
      password: faker.internet.password(),
      email: faker.internet.email(),
      id: uuid()
    });
  }
  return arr;
};

const addDupes = input => input.reduce((acc, curr) => {
  acc.push(curr);
  if (Math.random() < .2) acc.push(curr);
  return acc;
}, []);

const array = addDupes(createFakeArray(1.5e3));
console.log('Array length after adding duplicates');
console.log(array.length);

// push method uses UUID for duplication
suite.add('push with object lookup uuid comparison', function() {
  const map = {};

  const result = array.reduce((acc, curr) => {
    if (map[curr.id]) {
      return acc;
    }

    map[curr.id] = true;
    acc.push(curr);
    return acc;
  }, []);
})

// reference equality via indexOf
.add('push indexOf', function() {
  const result = array.reduce((acc, curr) => {
    if (acc.indexOf(curr) > -1) {
      return acc;
    }
    acc.push(curr);
    return acc;
  }, []);
})

// reference equality via includes
.add('push using includes', function() {
  const result = array.reduce((acc, curr) => {
    if (acc.includes(curr)) {
      return acc;
    }
    acc.push(curr);
    return acc;
  }, []);
})

// set method uses reference to detect dupes
.add('create a set', function() {
  const result = [...array.reduce((acc, curr) => acc.add(curr), new Set)];
})

// set method with chunkify
.add('use set with chunkify', {
  defer: true,
  fn: function(deferred) {
    chunkify.reduce(array, (acc, curr) => acc.add(curr), { chunk: 2000 }, new Set).then(result => {
      [...result];
      deferred.resolve();
    });
  }
})

.on('cycle', function(event) {
  console.log(String(event.target));
})
.on('complete', function() {
  console.log('Fastest is ' + this.filter('fastest').map('name')); // set is faster [node used: 6.9.2]
})
.run({ 'async': true });