If it were my decision I would go with Jackson.
Here are my reasons, however idiotic
Oakland is playing KC. The Oakland Def sucks ass, so this game could be a blow-out early, meaning it will be three quarters of Kerry Collins dropping back and chucking it downfield, seriously limiting L-Jordans touches.
Also, IMO Jackson is used more by StL in both phases of the offensive game plan, so even if their plan is limited wrt the run, he still gets you receptions/ rec yards.
That's my take. Which ultimately means Jordan will probably rush for 155 yards, and have 6 receptions for 75 yeards, and Jackson will get injured on the first drive .