PPR flex: Maclin or Breaston?

[Whisper]

0.5 PPR, 10 yds/pt rushing and receiving, 6 pts per rushing and receiving TD, no bonus points for long receptions/runs/passes.

My team was fairly devastated by Grant's season-ending injury, so my one replacement back (Hightower) is now my RB2 instead of a potential flex play. I wasn't able to get Jackson off the WW (missed him by one pick), but I did get Vick, who's now my starting QB over Kolb (yeah, last week was rough for me).

This means that my flex spot is now open to one of the following:

Maclin @ Detroit
Breaston @ Atlanta

I'm leaning toward Maclin based both on match-up, and his potential chemistry with Vick; Atlanta's defense definitely looks tougher than Detroit's, and Anderson is still working on his timing...so Atlanta will likely blitz the crap out of him, making Breason a risky play.

Thoughts?