Which is better in oblivion the dark brother hood or Morag Tong?

which guild of assassins should i join in the elder scrolls 4 oblivion





and which has the best rewards?|||The only Morag Tong NPC in Oblvion is from the Mehrune's Razor add-on, and the faction is not joinable.|||there is no joinable guild called morag tong|||dark brotherhood