Because Beyoncé is more relevant
Also, it's a better song

Beyoncé is bigger and Run The World is better

1. Bey is still hugely successful. Gaga is a fading star.
2. BTW was frontloaded and relied mostly on TFM's momentum.
3. RTW has aged better than BTW which sounds tragic in 2016.
4. Some people bought the Immaculate Collection instead.

Edge of Glory will shoot up to #1 on iTunes after Superbowl and eventually becomes the album's most iconic hit while BTW will be completely forgotten very soon. Mark my words.

RTW aged well and has better longevity

This such a biased piece of crap. They took a stylistically sung chorus and attempt to criticize it, when the song's lyrics as a whole consist of intelligent and thought provoking ideas and arguments about sexism and the power, and impact, of women.