ConvertKit - custom form or their form embedded?

I’m starting a newsletter. With convertkit to start…

Is it better to use webflow form to email subscribers and then connect that to convert kit. Would a welcome email still send to them?

Or should I use their embedded option?

I included a link (not complete but showing both options for reference).
https://preview.webflow.com/preview/construction-karma-a466ac?utm_medium=preview_link&utm_source=designer&utm_content=construction-karma-a466ac&preview=6b0d75dab8ab1b44c6a64c987f7f2542&mode=preview

Thanks!