I'm not comparing old e2k with old BitTorrent. I'm comparing "modern" e2k with modern bittorrent.
Its hashes use an outdated algorithm.
Torrent files are more complete and reliable that e2k links.
Speed is also way better on bittorrent nowadays, not only because the amount of peers, but because the protocol works just better coordinating multiple peers together.
Also BitTorrent is better at avoiding cluster on your router. E2k peers will hit your router for apparently unknown reasons all the time even if you are not sharing anything.
There's reasons why people moved away from it.
For its time it was great, I agree. But bittorrent became the better p2p protocol over time.