Choose tldraw if you're a developer or product team looking to create collaborative projects on an infinite canvas. Its polished design, real-time collaboration features, and capability to turn sketches into functional UI make it an excellent tool for building custom applications. However, be aware that commercial use requires a paid license, so if you're seeking a truly open-source solution or just need a basic sketchpad, you should look elsewhere.
On the other hand, if you are a frontend developer or indie hacker focused on generating real, editable UI from prompts, opt for v0. Its strength lies in producing functional React/Tailwind code quickly, making it ideal for those who work within that ecosystem. Just keep in mind that its credit-based pricing can become a constraint for heavy users, and it’s not suitable if you don’t use React or Tailwind or require a full no-code site builder.