Is Doug Martin a good play?

12 Team Half PRR

In the Semis going up against a really good that also got to start Damien Williams while my QB Mahomes didn’t have his best game ever, that being said I need some big games.

I know I’m playing Dalvin Cook and Jaylen Samuels (if Connor doesn’t play)
But my flex spot is a total guess on who will be best.
I have:

Mark Ingram
Doug Martin
Sony Michel

Which one of those three would you start?
And in the event Connor does play, which two would you start?

In standard I’d go Martin Sony then Ingram
Ppr id go Martin Ingram then Sony

In that order