For quick brainstorming and sketching, choose Excalidraw. Its charming hand-drawn aesthetic and offline capabilities make it perfect for developers sketching architecture or those needing a simple, low-fidelity space to visualize ideas. It's free and open source, catering well to users who prefer keeping their data local. However, if you require polished visuals or a comprehensive design tool, this isn't the right fit.
On the other hand, if your focus is on creating and publishing real websites without coding, go for Framer. It's ideal for designers and founders looking to build marketing sites or portfolios, thanks to its strong animations and pre-built templates. Be aware that while it provides ease of use, working with complex web applications or requiring full control over code would necessitate steering clear of this tool.