Miller for Jackson, Shepard for Breida?

Need urgent help on trade offers. 12 team, superflex, flex roster PPR league:

My team
QBs Goff, Murray, Jones
RBs D.Johnson, D.Freeman, L.Murray, A.Peterson, C.Edmonds
WRs OBJ, Woods, Shepard, M.Jones, D.Jackson, A. Miller
TEs H.Henry, D.Walker

Looking to add RB depth - Can get J.Jackson/ J.Hill for A.Miller or M.Breida for Shepard. Should I hold, or take one of the of the two?

Cheers