Advantage: Azureus

Something neat that I just found out about the BitTorrent client called Azureus: it lets you go inside a single multifile torrent and pick the files you want. This is patently against the BitTorrent philosophy, but dammit if it isn't a useful tool to have when you need it. In the "Files" tab, you can set each file's priority to one of "high", "normal", or "do not download".

Furthermore, the B52 beta release introduced the "Swarm" tab, that lets you visually grep what hosts are connected to you. Neat.

I find myself going back to the mainline client more and more, just because it gets better speeds and tends to play better with others, but Azureus is continually showing me that when I need features and not just raw download speed, it never disappoints.