Who would Cthulhu be more concerned about losing his world domination to, Daleks or Cybermen?

Cthulhu does not worry about such science fiction. He would worry about The Silence – IF he worried at all. – cultist 17

I’m not sure that you realize this, oh questioner, but both those things are fictional, and not the sort of fictional that come from raving hallucinations Great One’s whispers. Cthulhu is real. Concern is not an issue. – cultist 29