Diaz or Gakpo?

Okay so I'm guessing a lot of you might also be in the same boat. Liverpool have a very good record against United and given how the two teams are performing as polar opposites, I want to maximize on the haul potential.

I have the required funds and the FTs but I can't make my mind up on whether to go with Gakpo or Diaz against United. Diaz has returned better, but Gakpo has been consistently starting for Liverpool lately. Plus Diaz gets every alternate start and since he played the last game, he's at a risk of being benched against United

Who would y'all pick?