Who's better, Clinton Portis or Tatum Bell?

[PSUSkinsFan21]

I've seen some pretty absurd threads on this site, but this one is really up there.
If we are really comparing the two (even though there really isn't a comparison), shouldn't we also take into account the durability of the two backs? Tatum Bell spent a significant portion of last year missing games for a variety of injuries.
Additionally, shouldn't we also consider that Portis won the Denver starting RB job a few games into his rookie season, while Bell has been with the team for 21 games and is still yet to start a game.
I just can't even imagine seriously comparing these two guys at this point. Bell's career (over 1.25 seasons) has yielded 677 yards total. Congratulations to Bell for amassing 45% of what Portis had in his rookie year alone.
Next we can turn to receiving. For his illustrious career, Bell has amassed 8 catches for 104 yards. Portis, in his Rookie year alone, had 33 catches for 364 yards.
Factor in the fact that Portis is a better blocker and team leader, and I can't even imagine where the argument could be that Bell is somehow better than Portis.
Bell had a better game than Portis? So what? Bell wasn't playing on the road against Denver's defense and Portis wasn't playing at home against our defense. I hate to say it, but those two big runs were the result of our Defense simply breaking down. Do you really think in the same situation Portis wouldn't have done as well?
It's just a rediculous argument.