RB and Flex help

10 team PPR (1 pt).

My team

Qb Foles
Rb Ball playing seattle
Rb sproles playing wsh
Wr Dt88
Wr Antonio brown
Te D. Walker
Fl colston playing minn

Be r Jennings playing hou
Be j bell playing gb
Be b cooks playing minn
Be j hill playing tenn

Can't decide who to start for my rb/flex. Tempted to bench ball against Seattle in favor of Jeremy hill vs tenn or r Jennings vs Houston. Would also like an opinion on a starter for my flex as well. Don't expect a repeat of colstons performance last week. Feel like I will regret it if I bench him. Gracias.