Flex: Drake or Mostert?

Who are you flexing this week?? I’m leaning Drake but want the footclan to weigh in.

Roster:
QB: J Allen
RB: J Jacobs and J Taylor
WR: R Woods and Lizard King
TE: Fant
Flex: ???
D: Rams

I think Drake. I’d feel comfortable playing both but Taylor and Jacobs need to be starting.