Vuze is the best on all platforms. Period. Using the DHT tracker it automatically finds more peers then your regular client and as a result, your transfer will finish faster.
It is also the most customizable torrent client out there.
Err... no. You're basing a software being the best on that one aspect. An aspect that only matters that assumes you need more peer connections in order to max out your connection. Most users don't need that amount of customization (uTorrent is far more customizable than I'd ever need or want) nor the bloat. Torrent applications are something I want to run in the background, using at most half my connection rate. I don't use them near enough to want more. Therefore uTorrent is the best for me. Period...