Need Upside: Morris or Fitz .5 PPR

So I’ve got a tough matchup this week and my opponent got off to a good start on the 1st Thanksgiving game.
Who gets me more upside in my Flex (.5 PPR)?
“Old Reliable” Larry Fitzgerald
Alfred Morris

Ive gotten good reasons in my head to start either but with one starting in an hour I’m not sure what route to go.