LaPorta might get more targets since David Montgomery is injured. I think, I would start Jonnu Smith personally though.
But, part of me thinks that you will be less upset with yourself about choosing who to start; if you flip a quarter and call heads or tails for each player to choose.
I could see the Lions getting an early type lead; the starters getting only 1st half stats and Jonnu Smith has been putting up decent 4th quarter/OT numbers, lately. I vote Smith, but it is very close. Good luck! Also, Goff has been doing better than Tua lately mostly; so maybe LaPorta gets a 2 TD type game again, like you mentioned. Tough decision for sure.