Well I guess, I use BitComet as torrent downloader. Well I believe it depends on the file we download how the downloading time will take. The more seeds or leechers the good download. In organizing the file well for it is BitComet much easy to manage the files I download and still downloading. I like the Floating Window. It shows the graph of the download bandwidth.
uTorrent and BitComet are both equally good. The downloader doesn't really matter, as long as you have a genuine torrent with a large number of seeders. Sites like isohunt and piratebay usually have decent torrents.
I mostly use extratorrent as it gives info to the newly released movies in a quite good manner and the quality of the movies are also available to check before downloading
My favorite torrent client is definitely uTorrent. I like its interface, its lightweight and very easy to understand too. I don't remember if I tried some other client or not.
uTorrent, because it's the most famous, I guess and I even haven't tried the other torrent programs, but soon I will because my speed with uTorrent is quite slow