it depends on the clients needs. When you have a bad performance in EditorX you build it wrong. The big plus for EditorX is the ecosystem of apps and a GDPR Compliant solution inbound. Webflow is just for Design and gives you clean code. When you need something special you have to pay a developer or choose a third party application or JS code that slows down your site.
I love Webflow and i have the most of my new clients there. It is a visual Code Builder with the best CMS on the market i think.
i think both have pros and cons