QWeb allows rendering templates on the server side, reducing the amount of computation required on the client.

It integrated with Odoo models, fields, and business logic. 

QWeb templates are compatible with Odoo Studio, allowing users to modify views without coding. JavaScript frameworks would require more advanced programming knowledge.

QWeb is optimized for generating PDFs using wkhtmltopdf.

Have you seen our documentation, particularly "A Brief History Of QWeb" at https://www.odoo.com/documentation/18.0/developer/tutorials/server_framework_101/14_qwebintro.html