Vuze(Azureus) v.s. µTorrent

I have been hearing a lot from these two P2P file sharing programs called Vuze and µTorrent. Also doing a little research myself and found that most of the argument were based on whether which software runs on more RAM. Well under that competition Vuze was the absolute winner for eating up memory. However, memory is not really my problem for I have plenty of. My question is, which program has a higher download speed and equally as important has a more advance security from anti-privacy and other P2P users?