well I'm not sure how limewire works, I think its just 1 to 1? Torrents can be unlimited seeders so it can be like 150 seeders, making the download lightening fast.
It also reduces the risk of downloading a misnamed file, a virus, or a corrupt file, because many torrent sites have a comments section, as well as a rating of the quality.
I use mininova or TPB, because for one you don't have to sign up, and two, there is a good comments section that you can often refer to for help.
http://www.mininova.org/
http://thepiratebay.org/