Without a review of you current site structure one can guess. I will say that “dynamic pages” with Webflow are not truly dynamic. Yes the come from collections, and from your data entry in to them, however they are served as static resources as far as Google is concerned.
Overall Webflow sites can present much cleaner code than any Muse site easily. I can say that I have been doing optimization since the early days of Google, and have had no issues with sites migrated from other systems. I helped I new client off Muse recently, with almost no changes to the content, the site organic traffic was up 300% just from the revised site structure, layout (better engagement) and semantic code. Look at the source code of a Muse site. Scary.
If you depend on SE traffic for business, a deep analysis is in order before making changes. There are a lot of things that need to be addressed when moving sites to different platforms. Structure, tags, content, mobile first indexing, page rank sculpting, etc… Make a list of things that are important and research them.
I have no issues recommending Webflow as a base for a solid SEO website.