Flex Help - DJ Chark or John Brown

Need help on flex spot… Here’s my Week 7 lineup:
QB - D. Prescott
RB1 - D. Johnson
RB2 - P. Lindsay
WR1 - Julio Jones
WR2 - T. Lockett
TE - E. Engram
Flex ______
K - R. Gould
DEF - Bills

Options are John Brown or DJ Chark? Both look like viable options this week. HELP! lol