What taylor did with her letter didn't change the industry, no one's going to remember how she cried about the fractions of pennies she would lose if Apple didnt pay up.
No. Jay-Z has done more in his career than Taylor Swift has and so has Beyoncé. Just two years Hov made that deal with Samsung which changed the game and Beyoncé changed the marketing game with her surprise release.
They both have impact, and if you wanted to put Jay vs Tay or Bey vs Tay, that would be fine, but together, it's not a contest.