With Edge you know what you are gonna get and he doesn't have huge upside, he'll probably be just consistent. Jacobs, is an uncertainty - he has huge upside and could score 20 TDs if the Giants offense can get it together. Giants are about the middle of the pack as far as strength of schedule.
If Jacobs value isn't this year, then it's never going to be any year. Droughns is no threat.