Well, if we're talking about web, then I it's better to use WebP rather than PNG.
It's widely supported by vendors if you do not need to deal with IE: https://caniuse.com/?search=webp.
It's widely supported by vendors if you do not need to deal with IE: https://caniuse.com/?search=webp.
WebP is available for macOS 11, even with overlapping versions of Safari, but Apple relies on the OS image library to render some images and they haven't backported WebP supported when they updated Safari.