In most cases I prefer the WebP versions, but the JPEG formats handle chroma noticeably better. E.g. look at the purple band on the rightmost helmet in the 500

In most cases I prefer the WebP versions, but the JPEG formats handle chroma noticeably better. E.g. look at the purple band on the rightmost helmet in the 500 pixel version of Kodim 5. WebP reduces the saturation by excessive blurring. CJPEG handles this image best IMO.