It depends on the implementation. fpng can beat QOI in both speed and compression ratio https://github.com/richgel999/fpng
> It achieves similar compression to PNG
It really doesn’t, even on Wii’s own curated corpus qoi is often >30% larger, and on worst case scenarios it can reach 4x.
I'm also a big fan of QOI as a simple imagine format.
Yes, it's not as good as PNG (as the sibling comments point out), but I view it more as an alternative to PPM (and maybe a BMP subset), as something that I can semi-quickly write an encoder/decoder if needed.
IMO, PNG is in a completely different level. Case in point, in the linked article the author mentions to not worry about the CRC implementation and "just use a lib"... If that's the case, why not just use a PNG lib?
https://qoiformat.org