New To Drupal. Why should I move from WordPress to Drupal?

I have been working on a complex website rather than just building a blog. My question is that can drupal help me build complex site. Currently, I am working on wordpress but my friend suggested me to try drupal since he is much active on drupal since he started into website development market. So, my question is what kind of Flexibility drupal can provide me over wordpress?

Also, I have other 5+ blogs which are currently on wordpress, if this complex website thing works, then I would like to use only one CMS and i.e., Drupal.

Thanks,

Alex.

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