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I say Cobb. I also hold more WR in PPR leagues though. I typically find more value with WR in PPR leagues than RB, in 1pt PPR leagues of course.
I dont think you can wrong with either though. I think it also depends on your draft position (if you know this already). If it's high, you can get AP and use the keeper option on cobb.
I'd do the trade. ODB was unstoppable last year, even with double coverage. With Cruz coming back, teams wont be able to double cover him as much.
Funny coincidence, your username is my FF team name. Minus the 68.
Good Luck!