If I buy “Custom Branding” (in new to WIX) - will that change the wix url client gets. I dont see why to change logo, if url is still showing wix editor ect. 
Hi Morten,
it will show for example:
morten.wixsite.com/sitename1
morten.wixsite.com/sitename2
and so on.
It will show your logo on the left side and the following sentence on the right side: "This website was created by Morten Agency " (The agency name will be connected to your agency’s website.)
It is simply to show that you are a Wix Partner.
I would not buy it. When you have the icon status (20 Premiums or more) then you can have it for free.
https://support.wix.com/en/article/wix-partner-program-benefits-2555459