Help Fast!

[average_joe]

Just found out Beany Wells is out. I have Larry Johnson WAS on my bench that I can still play, or Brandon Jackson GB is available to pick up. Is there value in Jax over LJ. I know both are backups and not worth a lot, but is one worth more long term? Especially if Wells doesn't play for a few weeks.
LJ is home v. Dallas and Jax is at Philadelphia. Non PPR, standard RB scoring 10 yds/1 pt and TD/6 pts and fumble is -2pts.

Thanks!