Second option is better, because it will motivate you by seeing the prototype working..see it as an MVP or an advanced prototype , which you can use to gather feedback loop.

Remember in software the feedback loop is important. The more often and quick the best. This tou can do with vibe coding

You can see vibe coding as a replacement of a gui sketcher like Figma, etc, not as a replacement of a coder.

And In Figma you have to draw this yourself, in vibe code it draws for you.

Maybe there's some VibeFigma, which focus only on the user interface