Gravity Forms is far and away the best way to build forms into your WordPress site. From simple form management in a drag and drop / no code editor, to custom notifications and confirmations, to dynamic shortcodes making it compatible with any theme, that alone should make Gravity Forms better than its competitors, but there's more.  This video explains CRM / email marketing integrations, conditional logic, add-ons and query strings, and that doesn't even begin to mention the loads of feature rich gravity form extensions like WooCommerce product forms, quizzes, legal signatures, buildable PDFs and more.  Gravity Forms is not only the best forms plug-in for WordPress but truly is one of the most scalable plug-ins overall as well.