Kaltura‘s built-in analytics and reports provide the insight you need to successfully manage content and make decisions based on real data.
WordPress and Drupal are both great tools and ideal for different types of websites. Your individual website needs will play a role in which CMS makes the most sense for you, so weigh the differences and similarities before you develop.
Proposes a valuation based on more then 20 metrics to measure and track success of a website: http://www.websiteoutlook.com/
Useful formula to determine an exact sample size for qualitative research: https://www.smashingmagazine.com/2017/03/user-research-sample-size-data/