When comparing Nightwatch.js vs Endtest, the Slant community recommends Nightwatch.js for most people. In the question“What are the best Javascript end-to-end testing tools?” Nightwatch.js is ranked 2nd while Endtest is ranked 9th. The most important reason people chose Nightwatch.js is:
Nightwatch solves the [Paradox of Choice](http://www.ted.com/talks/barry_schwartz_on_the_paradox_of_choice?language=en) among testing frameworks such as Jasmine, Cucumber or Mocha+Chai, by including its own BDD-style assertion library, based on Chai.
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Pros

Pro You don't have to choose a testing framework
Nightwatch solves the Paradox of Choice among testing frameworks such as Jasmine, Cucumber or Mocha+Chai, by including its own BDD-style assertion library, based on Chai.
Pro Includes its own testing framework / assertions library
Pro Test organization is out of the box
Supports page object model, custom commands, custom assertions, and globals.js.

Pro 3rd party integration with Cucumber
Though Cucumber is not officially supported, Nightwatch can be used with Cucumber.
Pro Codeless automated testing
Endtest allows you to create automated tests for web applications, directly on their cloud infrastructure. No coding skills are required.
You can also choose the action "Execute Javascript" for a more flexible test run.
Pro Running your automated tests on their cloud infrastructure
You can easily run your automated tests on their platform, just by clicking the run button.
Pro Designed for Continuous Integration
It has an API which allows testers to run it on Jenkins or Team City. Other than that, it has a built-in test scheduler to allow testers to preset test executions.
Pro Now supports mobile testing
Endtest has added a new feature which now supports mobile testing for both Android and iOS (.apk and .ipa).
Pro Option to export your automated tests in different formats, including .EXE
You can export your automated tests in a variety of different formats, and run them on your own infrastructure. The formats are either in Python file format or executable file format (.EXE).
Pro Now supports a wider variety of browsers, operating system and devices
As of March 2018, Endtest can now support multiple platforms (Windows, MAC, Android and iOS), Operating Systems, and more than a handful of devices for both Android and iOS.
Pro Super fast and affordable.
Pro Premium version is relatively cheaper than most in the market
Their pricing plan ($79/month or $650/year) includes team plan upgrade, which means the whole team, regardless of the number of users, will only need to subscribe to the $79/month or $650/year plan. This includes unlimited test runs, test exports, recordings, etc.
Pro It's mostly free to use
The free plan covers a lot, you can have up to 3 test suites, and you can run your automated tests as many times as you want. The pro plan includes some very advanced options that you might need only if you're working with a team (for example, the collaboration feature, schedule test run, API for Jenkins, etc.).
Cons

Con No official BDD-style syntax support

Con Includes its own testing framework / assertions library
Unlike WebdriverIO, which lets you use various test frameworks and assertion libraries (e.g. Jasmine, Cucumber, Mocha + Chai), Nightwatch comes with its own BDD-style interface for performing assertions, based on Chai.
Here's a simple test example:
module.exports = {
'Demo test Google' : function (browser) {
browser
.url('http://www.google.com')
.waitForElementVisible('body', 1000)
.setValue('input[type=text]', 'nightwatch')
.waitForElementVisible('button[name=btnG]', 1000)
.click('button[name=btnG]')
.pause(1000)
.assert.containsText('#main', 'Night Watch')
.end();
}
};
Con Doesn't support a wide array of browsers and/or operating systems
Because it's still in its infancy, it doesn't yet have a huge variety of browsers and operating systems.
Con Free plan has limited time storage for test suites
If you are using the free plan, keep in mind that the test suites created there are scheduled to be deleted after around 2 weeks. Endtest will send you a notification email the day before mentioning "Test suites from users who are not on the PRO Plan get automatically deleted after some time," and offering for you to upgrade to PRO.
Con Codeless and locks you in rendering your efforts useless if you want to switch
Con Bad UI
