Jamaal Charles (@ HOU) or Hines Ward (vs. CLE) for flex?

Charles should get most of the workload and has the skills to be a top RB in the NFL, but faces a surprisingly tough Texans run-defense, while Ward gets a huge boost with Big Ben back and gets to face the Browns weak defense at home who he had burned in both games last year for a combined 12 rec., 180 yards, and 1 TD. I'm leaning towards Charles anyway despite the unfavorable matchup, but I'm open to your opinions. Thanks!