Androstendione vs Androstendiol

I have heard that Androstendione is a great product to take 30 minutes before sex. Which one is better as a libido enhancer, Androstendione or Androsol?

Doug Kalman reported on a study where middle- aged men were given either 200 mg/day of androstenediol or androstenedione. To make this short, only the diol improved sexual function.