Who to start in the FLEX? Any Comments are Welcome

Trying to decide who i should start between Miles Sanders and Cooper Kupp

Its a non-PPR league and I think that Kupp could be in for a big game, but Sanders did look good last week. Any thoughts would help.

Rest of Team

RB1: Dalvin Cook
RB2: James Robinson
WR1: Diggs
WR2: AJ Brown
Flex: Sanders or Kupp