Target a WR or RB?

I am trying to cash in on Gillislee’s good week 1, since I’m unsure of his workload going forward. Here is my team, should I target a WR or RB?

WR: OBJ, T.Y. Hilton, Devante Adams, Adam Thielen, Tyrell Williams
RB: Ty Montgomery, Leonard Fournette, Mike Gillislee, Jacquizz Rodgers, Kerwynn Williams

I lean toward trying to get a RB, but struggling with who to target.

.5 PPR, 3WR 2RB Flex.

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