H.264 (which is what most people mean by MP4) will force chroma subsampling, which makes saturated color edges look blurry or dirty. VP9 (aka WebM) can do bett

H.264 (which is what most people mean by MP4) will force chroma subsampling, which makes saturated color edges look blurry or dirty. VP9 (aka WebM) can do better (has full-res color). AV1 is even better for this, because it supports lossless block types that are great for screen content like text and icons. …but GIF works everywhere. GIF is technically outdated in every way, but has unbeatable interoperability.