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
Great to hear and good luck! Another good thing to know is, that you can always convert back and forth between JPEG and JPEG XL without any data loss, I love that functionality!