This is one of my favourite comparison of the bunch. Tl;dr JPEG XL is actually made for pictures and not just a still frame of a video and it truly shows. Cloudinary has a lot of great content talking about its advantages for the web: https://cloudinary.com/blog/tag/jpeg-xl
https://res.cloudinary.com/cloudinary-marketing/image/upload/w_700,c_fill,f_auto,q_auto,dpr_2.0/Web_Assets/blog/Battle-of-the-Codecs_fnl.png
This is one of my favourite comparison of the bunch. Tl;dr JPEG XL is actually made for pictures and not just a still frame of a video and it truly shows. Cloudinary has a lot of great content talking about its advantages for the web: https://cloudinary.com/blog/tag/jpeg-xl