It is between the 49'ers and Cardinals. The Rams offensive line is horrible, and Jackson is the only back worth diddly-poop. The Seahawks are searching for a RB, and offensive line.
Between the Niners and Cardinals
It really comes down to the offensive line. Unless you consider your 3rd and 4th backs, where the Cardinals MAY have a slight advantage.
Right now I consider Gore and Wells are push. Gore obviously has the production and well earned respect, but he is getting older. Wells has the youth, but not yet the production and earned respect.
Hightower may be better than Glen Coffee but I have not seen enough out of Coffee to make that determination. Yet, when I did see Coffee play, he looked pretty good.
In terms of Robinson/Nixon vs. Wright/LSH it is of course debatable, but I find LSH to be a big weapon, where Robinson, the wildcat option, seems to have not found his niche.
As for the offensive line. The Cardinals are not even in the re-building stage, they are in the improvement stage. 5 years ago the Cardinals had offensive linemen starting for the club, that today wouldn't even make the roster. Right now, not only is the line stable, we are looking to constantly improve each position at every oppourtunity.
The 49'ers are still trying to stabilize their line. The fact that there might be 2/3 rookies on the 49'er offensive line is going to be an extremely rude awakening for all the 49'er hopefuls. Cause the line is going to have growing pains, and there is no Kurt Warner at QB to make the quick read, and release to compensate for the inexperience in front of him. Let's just say that it is a good thing Alex Smith is mobile, Crabtree is tall, and Gore is beast because there is going to be a lot of, hope & a prayer plays on offense in SF this year.
It is close but I think the Cardinals will be able to run at will this year, and I don't think any other West team will be able to do so.