You don't need usenet for these, by the way, it's all torrent driven.
Usenet tends to be faster, however. Torrent download speeds are highly variable: fairly quick for popular files that everyone else is downloading at the same time, not so much for other files. I've had to leave many a torrent running for days or even weeks for it to complete. SABnzbd, OTOH, will usually pull anything that hasn't expired at 5.5-6 MB/s (bytes, not bits) over my connection, which is pretty much as fast as the connection supports.