Who should i start this week: LeGarrette Blount or Peyton Hillis?

LGB plays Atl who has the 9th ranked run D and Peyton plays Ne who is the 22nd run D. this week is a must win for me. im right now 4-4. i was 3-0 but now went 1-4. i took a chance in trading chris johnson for randy moss and LT. and well the vikings never got the ball to randy so thats been a bust for me. so who should i start LeGarrette Blount or Peyton Hillis and why?