This is the default Webflow FORM configuration;

• + Automatic data collection into Webflow's forms database.
• + Automatic email of form captures to e.g. clients.
• + Nice success / failure display, customizable.
• + Does not need a "success" page to redirect to.
• + reCAPTCHA supported ( but v2 only )
• + Form posts can be picked up from the API via automation like Zapier ( may not be instantaneous )
• - Limited controls, but all the basic ones. No richtext, slider, etc. File upload?
• - No ability to separate form behaviors, e.g. some email, some don't.
• - No in-built ability to post to the CMS, or to an external database e.g. comments.