Very tough call. Jackson has the Pitt D to deal with but Philly has been so productive. Cotchery is the deep threat but the SD secondary is talented. That being said, I think the Jets will be playing catchup so go with Cotchery.
I'd lean towards Jackson only because the Jets offense has been pretty bad so far (they barely beat the dolphins). I like Cotchery later in the year when Favre and the offense get going but not right now.