my experience with torrent client lear me that there's no a law: generally those based on java, like azureus and bit lord, have some interesting features (bit lord can download even 9 torrent and do that so high). The realy power of p2p is the development of new internet tecnologies: now we can use some types of network and all have goods and faults (see gnutella, magnetik, irc, and torrent of course). you have to try most client to find the one that works better, for example i don't use emule, it woks very bad on my pc downloading 5 kb\s max, but a friend of mine downloads to 50\60 kb\s... and we have the same dsl speed! but edonkey works very well for me and not for him! ok i can stop here,  and sorry for my bad english, but i don't speak that since i finish the school, ten years ago, see ya