D. Aardsma or H. Street for DL'd F. Francisco?

[WHYOS]

Who will be most productive; David Aardsma or Huston Street?

12 team 5x5 Roto; Mixed, Non-Keeper League. 22 Positions. 3 FA pick-ups per month; limited trades.

C Martin, Russell C LA
C Navarro, Dioner C TB
1B Delgado, Carlos 1B NYM (DL)
2B Fontenot, Mike 2B CHC
3B Longoria, Evan 3B TB
SS Jeter, Derek SS NYY
OF Sizemore, Grady CF CLE
OF Hart, Corey C. RF MIL
OF Ibanez, Raul LF PHI
OF Span, Denard RF MIN
OF Swisher, Nick OF NYY
UT Branyan, Russle 1B Sea
CI Kouzmanoff, Kevin 3B SD
MI Guzman, Christian SS Was
SP Webb, Brandon SP ARI
SP Volquez, Edinson SP CIN
SP Myers, Brett SP PHI
SP Danks, John SP CHW
SP Jackson, Edwin SP DET
SP Saunders, Joe SP ANA
RP Rivera, Mariano RP NYY
RP Francisco, Frank RP TEX