Who uses BitTorrent anymore? There's a swath of other torrent clients out there that are superior to it.
uTorrent FTW
qBittorrent is much better
Though I use Transmission on my NAS4Free box, which I control remotely through the excellent transgui program (https://github.com/transmission-remote-gui/transgui) I also install qBittorrent to all Windows/Linux users asking for a client for it being very stable and consistent among platforms, the latter very important for newbies, but I see now they're porting Transmission to Windows as well. Good!
I don't consider closed source clients for security reasons, or bloated ones (Vuze etc.) because I'd rather use a spare GB of RAM to make a filesystem more snappy than to load a Java environment that eats alone half the resources of a small server.