Diaz over Rashford is a no brainer, come on...

We got Rashford because it was cheap and we could send him back after a season.
If you watch Rashford, he broke the pressing so many times vs PSG. De Jong alone was waving his hands 2-3 times at him, I saw Pedri once also.
And not becayse of laziness, but out of poor reading of the game.
Runs fast and sometimes he can fly one in the top corner, but that's about it, a typical EPL-style runner with a cannon of a shot. Has no idea how to press properly and knows nothing about positional football.
He can be of good use, but Diaz is far more polished.