I have to test a web application which uses PHP, Javascript and AJAX. I want to automate the testing using automation tool. I am new at automation tool, but manual testing for the web is a big burden. I will use the tool for functional testing and hopefully, it also can help me for system testing.
I have found some of automation tools that are widely used by tester, such as Watir, Selenium, QEngine. Is there any other great candidate or maybe one of them is the best? A brief information on the automation tool will be great (such as, advantage and disadvantage).