Hill is very predicated off of TDs.
But, he is one of their prime weapons around the goal line.
There's also the potential of him getting actual snaps at QB, not just wild cat stuff.
Pitts is averaging 5.5 targets per game. When Hill is in the game he's likely touching the ball, even if it's only 50% of the snaps he's out there.
Not sure either is worth it, but Hill is scoring TDs, Pitts is getting frozen out of the offense.