If you are a designer or agency looking to create a marketing site with a robust CMS, choose Webflow. Its pixel-level control and built-in hosting make it a powerful tool for producing professional-grade websites. However, be prepared for a steeper learning curve and potential costs associated with CMS items and traffic as your site grows.
On the other hand, if you're a developer needing to brainstorm ideas or sketch architectural concepts quickly, Excalidraw is your best bet. Its charming, hand-drawn aesthetic and offline capabilities make it ideal for informal brainstorming sessions. Just keep in mind that it’s not suited for creating high-fidelity, polished visuals, so you should avoid it if you require a comprehensive design tool for refined projects.