If you're a designer or agency looking to craft visually stunning marketing sites with robust content management, choose Webflow. It offers pixel-level visual control and outputs clean, standards-based code, making it ideal for projects requiring precision and polish. However, be prepared for a steep learning curve, and keep an eye on costs as your traffic and CMS items grow.
On the other hand, if you need a relaxed environment for brainstorming or sketching initial concepts, Excalidraw is the way to go. Its charming hand-drawn aesthetic is perfect for quick ideas and rough sketches, and it's completely free and open source. Avoid it if your project demands polished visuals or a comprehensive suite of design features, as its low-fidelity focus is not suitable for high-end presentations.