I don’t know what a .webp file is but I don’t like it. They’re like a filthy prank version of the image/gif you’re looking for. They make you jump through all these hoops to find the original versions of the files that you can actually do anything with.
JPEG XL came after WebP. It’s more of a successor and less of a competitor.
That said, in the world of standards, a successor is still a competitor.