ed2k is used for big files whilst your other filesharing network specialized on music or other small files. If you have small files the download speed is generally much higher.
Compare: One uploader, one song of 3MB -> One uploader, a 9.28MB part of a 4,9 GB Linux DVD image
In the same in which the first uploaded did upload the song 3 times the other just uploaded a tiny part of the whole iso.