+ What is best opensource for managing company official website ?

WORDPRESS is the best CMS available open source in PHP domain. Wordpress is giving all options which we usually needed on a company website like CMS base pages, photo gallery, clients, teams, testimonials and online ticketing or contact forms. Additionally wordpress also provide free and paid plugins to improve the visibility of website on search engines.

+ Why Joomla is not much in the market now a days ?

No doubt, joomla was a great and an extensive CMS available in PHP opensource but due to not providing updating as per the industry need so joomla is around to obsolete.