Better Keeper: Marshall or Mathews?

[DTMan]

Sadly my season has gone poorly so I'm looking tonight at our deadline to move Calvin Johnson (too expensive to keep next year) for keeper value. Most likely targets are Brandon Marshall and Ryan Mathews (wanted to get Graham but his owner is offline tonight). Marshall and Mathews would be about the same price - who would you rather have next year? My other sure keeper is AJ Green.

Will weigh in on yours in return.

Thanks,
Dan