However I’m not sure how trustworty their own statistic is.
On the other hand Mozilla’s PoV:
neutral - JPEG-XL includes features and performance that might differentiate it from other formats, but the benefits it provides are not significant enough on their own to justify the cost of adding another C++ image decoder to browsers. A memory-safe decoder would reduce these costs considerably, and we are open to shipping one that meets our requirements.
From what I’ve read, AVIF doesn’t outperform JXL on any metric except browser support
Well Google said otherwise when they removed support for it: https://storage.googleapis.com/avif-comparison/index.html
However I’m not sure how trustworty their own statistic is.
On the other hand Mozilla’s PoV:
https://mozilla.github.io/standards-positions/
So AV1 is clearly the winner here, also because it can be used for videos and not just images.