WebP to PNG keeps everything
PNG is lossless and supports transparency, so every pixel of the WebP, see-through parts included, comes across exactly. It is the conversion to pick for logos, stickers, icons and cut-outs saved from a website, and for pictures you are going to edit.
The PNG is larger than the WebP, often several times for a photo. If you only need a picture that opens everywhere and it has no transparency, WebP to JPG gives a much smaller file.