The best replacement for deluge is transmission.

The best alternatives to deluge are rated as following:
★★★★★  transmission
★★★★  utorrent
★★★  vuze
★★★  qbittorrent
★★★  ktorrent
★★  rtorrent
★  bittorrent
★  transmission raspberry pi
★  tixati
  azureus
  rutorrent
  bitcomet
  transmission linux
  pre action

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

Other search terms related to deluge and their ratings are:
★★★★★ flexget
★★★★ magnet links
★★★ btguard
You have in mind a companion for deluge and it is not yet here? Propose!



Google Trends

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