Collins, RoJo, or both?

Alex Collins and Ronald Jones we’re both dropped in my 12 team ppr keeper league. I have $50 FAAB left. Is it worth going for one or both?

We start 3 WRs and a flex
Current team:
Qb: Matt Ryan and Carson Went

Rb: Melvin Gordon, Carlos Hyde, Royce Freeman

Wr: Devante Adams, Adam Thielen, Doug Baldwin, John Brown, Taylor Gabriel, Mike Williams, Christian Kirk

TE: Trey Burton, David Njoku

I lost Ajayi and McKinnon so I’m lacking in RB depth. I’m thinking or dropping Kirk and maybe Njoku for RoJo or Collins.

I’m currently sitting at 4-1 so I’m thinking of stashing RoJo, but Collins is obviously the better back in BAL if they ever realize that. Which would be a better choice? How much FAAB should I drop?