Lossless is pretty easy, there's no subjective qualities to compare, just file size. WebP Lossless almost always results in a smaller file than PNG. I have see

Lossless is pretty easy, there's no subjective qualities to compare, just file size. WebP Lossless almost always results in a smaller file than PNG. I have seen exceptions to this, but they're sufficiently rare that it's not worth worrying about.