When comparing PhantomJS vs Puppeteer, the Slant community recommends PhantomJS for most people. In the question“What are the best headless browsers for testing?” PhantomJS is ranked 1st while Puppeteer is ranked 2nd.
Ranked in these QuestionsQuestion Ranking
Pro Supports screen capture
Pro Used in many open source projects
Pro Supports many browser standards
PhantomJS has full DOM and CSS parsing, JSON, canvas, and SVG support.
Pro Built on WebKit
WebKit is becoming the gold standard for browser compatibility, making it a good starting point for native headless browser testing.
Pro Actively developed and promoted by Google
Pro Works great with modern node.js features
Pro Runs a real browser
Unlike the other options here, this is a real browser, just without the GUI parts. This means the quality of the test is much higher, and lets you do things like save to PDF or images.
Pro Complete API for Chromium included
Chromium tests depend on the same API that Puppeteer gives you access to, so all the features are included
Con Deprecated by Puppeteer
PhantomJS is no longer actively maintained by the original authors. Puppeteer is said to be a replacement supported and backed by the Google Chrome team, now.
Con Heavy setup
You'll often end up having PhantomJS binaries connected via WebDriver to your testing framework, possibly using client/server especially if you want your test running with something else than Java. This means an overhead in terms of maintenance and performance, but still usually lighter than running a full browser (like Chrome, Firefox, IE).
Con Browser closes unexpectedly
It often happens when running on more then 5 (my measurement) JVM instances that the browser gets stuck and quits unexpectedly. This can be partially solved by running the instances one by one instead of parallel (this is a problem when testing Jenkins and Bamboo agents) but I don't believe this qualifies as a solution. The error is called
Con Elements are sometimes not visible
This is an error which occurs with almost no reason, PhantomJS sometimes decides that it cannot click the element even though the element is intractable or enabled.
The error it raises is:
Con Not good for Cross Browser Tests
Since it only tests via Chromium, it won't help you test inconsistencies between browsers like Edge or Safari. There are projects to get around this, but they aren't mature.