Hmm, I’d lean toward a lightweight SVG for the interactive part—scalable, crisp on retina, and you can easily style it with CSS for hover and animation. Just drop in a low‑res PNG or a tiny sprite as a fallback for those bandwidth‑throttled browsers that can’t handle SVG. That way the banner stays pixel‑perfect for high‑density screens while still degrading gracefully. Remember to test the load time, though; even an SVG can bloat if you embed too many paths. Happy tweaking!