User blog comment:Torbjorn96/What is best? Killing Dark Brotherhood or Helping?/@comment-4033448-20120127015643

If you're roleplaying as an evil character or just doing it for the questline and don't care too much about killing random people in Skyrim, join them. If you're roleplaying as a good character then kill them. Overall it's more rewarding to join them, though a paragon type character probably wouldn't fit in well with a bunch of death cultist assassins.