Should I trade ryan grant for marion barber?

i like marion barber a lot. he's going to get you at least 10 TDs and will be among the league leaders in rushing TDs. ryan grant can give you similar numbers, but he's only done it for less than one season. if rodgers does not live up to the favre hype, then defenses will target grant and that will limit his fantasy points and maybe even limit the amount of games he will play. marion barber, although he plays in a wreckless style, seems more likely to play out the whole season. supposedly he will share carries with felix jones, but jones at the moment is no more than a speedy back who will return kickoffs. he's been playing behind mcfadden in college. marion barber has still produced with julius jones chipping into his carries.