I prefer to give them all website files (HTML/CSS files) and let them figure it out, but I don't think that is possible with Webstudio.
Giving them html/css means they wouldn't be able to hire a nocode developer, where the original build is in webstudio. Its not nice, hand them over the project in webstudio.
Of course you can use the cli and create an app for them that's an equivalent to html/css but for web apps.