I prefer Selenium Automation Tool because some of the benefits of Selenium to do automation testing are
Free and open source – It is a free open source tool. There is no need to allot budget for this tool
Help – Have large user base and helping communities.
Cross-browser compatibility – It works on almost all popular browsers such as Chrome, Firefox, Internet Explorer, and Safari.
Cross Platform compatibility – It works on platforms such as Windows, Linux, Mac.
Multiple programming languages – It supports programming languages such as Java, Phyton, Perl, Php, C#, Ruby, etc.,
Parallel Execution – Selenium Grid supports parallel execution of Selenium Scripts.
Continuous Integration – We can achieve nightly execution using Jenkins.