Juan P. I recommend Wordpress. Webflow has some limitations like 1,000 pages and some other issues related to SEO/ranking as well as customization. Also harder (sometimes more expensive) to find a designer for Webflow.
In terms of SEO considerations if the site mapping, content, pagination, tagging, and pretty much anything that is changed will affect you in some way. That is why it's highly important to work with a technical SEO team to make sure that you limit any loss and focus on what content is important to keep. Any change to the site will affect your SEO rankings whether good or bad. Your SEO reputation or Domain Rating/Authority is a long term score based on your content authority, strong backlinks, and much more. I'm not a SEO specialist but a lot to consider for sure