Utorrent refers to a freeware Bitorrent client that was designed for MS windows platform. BitTorrent is the global standard for accessing rich media over the Internet. It is a peer to peer communication protocol. I believe Utorrent is the better of the two. This is because it allows multiple and simultaneous downloads, configurable bandwidth scheduler, Global and per-torrent speed limiting, Quick-resumes interrupted transfers and Trackerless support etc.
Aicha is correct in one sense, but if you are talking about the programs, they are EXACTLY the same, except that the Bittorrent one uses a bit more memory.
I think bit torrent is faster because it has a capable downloading was and methods and it is faster even when there are things running. On the other side you torrent takes time when there are things running so I prefer bit torrent
Just a comment on uTorrent, I actually think that anyone who likes file sharing should definately get it. It is free, and much more trustworthy unlike something you would pay for like Limewire.