The best replacement for azureus is bitcomet.

The best alternatives to azureus are rated as following:
★★★★★  bitcomet
★★★★★  utorrent
★★★★  transmission
★★★★  vuze
★★★  bittorrent
★★★  bitlord
★★  limewire
★★  deluge
★  bittornado
★  utorrent mac
★  bit tornado
★  emule
★  abc
★  abyssus
  ktorrent
  shareaza
  bit comet
  ares
  edonkey
  bit lord
  miro

Your alternative for azureus is not listed? Suggest!
Speaking about azureus, one probably shouldn't forget about tor.

Other search terms related to azureus and their ratings are:
★★★★★ tor
★★ comodo
★★ i2p
You have in mind a companion for azureus and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of azureus in all years. Click on graph for more.
azureus
bitcomet
utorrent