Guide
SVG vs PNG for line art
SVG and PNG can both work for line art, but they solve different problems.
Use SVG when you need crisp scaling
SVG is a vector format. It is usually best when art needs to scale up or down without getting blurry. It is useful for logos, icons, simple line drawings, and clean digital graphics.
Use PNG when you need easy compatibility
PNG is a raster image format. It is easy to view, send, upload, and print. A high-resolution PNG can work very well for posters and simple artwork.
Best answer for most people
Use both when possible: SVG for editing and scaling, PNG for quick previewing and simple use, and PDF when sending a file to a local print shop.