WordPress is designed for simplicity and speed of setup, making it ideal for blogs, small business sites, and straightforward brochure websites. Drupal is built for flexibility and structured content, which suits complex sites with custom data models, strict permissions, or heavy integration needs.
WordPress has a larger ecosystem of themes and plugins aimed at non technical users. Drupal has fewer but typically more robust modules aimed at developers.
Security, multilingual support, and content workflows are generally stronger out of the box in Drupal. WordPress tends to be easier for content editors on day one. The right choice depends on whether you need quick simplicity or long term architectural control.