Charles for me by a pretty fair margin (although if you've followed any of my posts on these boards you'll have noticed that I'm picking Charles 1.01 this year and honestly don't want Martin any higher than 1.04 at best). This is for several reasons.
If Charles wasn't on one of the worst offenses in the NFL last season he'd probably have been a Top 3 RB last year. His points were really only hurt because of his lack of scoring production. This season he'll see more touches than last season and he'll probably eclipse 60 receptions with ease. He's also now on an offense which boasts one of the better offensive lines in the league, has a new good steady and consistent QB and one of the greater offensive minded head coaches we've seen in the past two decades. All of the writing is on the wall for Charles this season short of an ACL tear I really think he's the most likely RB to be RB1 at the end of the season. Also bear in mind that last year there were several games where Charles saw under 10 carries because his coaches are awful. That simply won't happen with Reid there. He'll be seeing 15+ touches a game more or less guaranteed. My projection for Charles this season will be 290 carries, 1500 yards, 10 TDs. It's not super likely he eclipses 300 carries, Andy Reid RBs usually don't, he'll more than make up for that in receptions though and will likely lead all RBs in that statistic when 2013 is in the books.
Martin produced 33% of his production all of last season in two games last year. If those two games were changed up to his 'average' on the season he would have finished closer to around RB8 or 9 instead of RB2. I'm firmly in the camp that Martin has a rather large sophomore slump this season. Last years numbers were 319 carries, 1454 yards, 4.6ypc and 11 TDs. I think we'd be lucky to see 300, 1260 yards, 4.2ypc and 8 TDs this season. Still a solid season but a far cry from a Top 3 fantasy pick. I'm taking these numbers mainly assuming he'll be 'more consistent' this season and by being more consistent his numbers will drop as he won't put up a 4TD game vs Oakland this year. Some people have made the argument in other threads of
How can you call a player inconsistent with only one year of production behind him?
My only real response to that would be how can you call him not-inconsistent with only one year of production behind him? We have to look at the information we have and the information we have could go to say that Martin had two lucky games against two of the worst rushing defenses in the NFL last season. The rest of his games were all average at best. So I'd rather go with the majority of the information (14 games) that say he's an average to above average player than include the minority information (2 games) that portrays him as an elite player.
So yeah for me, it's Charles by a pretty large mile.
I like this post but I think 290 carries is using a ceiling instead of a base.
Leading rushers under Ried the last 5 years
2012 - Mccoy was on pace for 267 carries
2011 - Mccoy on pace for 291 carries
2010 - Mcccoy on pace 221 carries
2009 - Mccoy's rookie year + Old Westbrook so let's not even count that as there seemed to be a weird split going on.
2008 - Westbrook on pace for 266 attempts.
Average is 261 carries per season with a median of 266.5 carries
261-267 seems to be the baseline for carries for Charles this season based Reid's tendencies in loving to pass the ball and how he has used his rbs in the past. Of course 290 is attainable (see Mccoy 2011) but I would call that Charles' ceiling in carries.
Andy Reid stopped calling the plays after the 2008 season. You should baseline over the seasons prior, when he was still calling the plays, since he's doing that for KC.
So, looking at 1999-2008:
1999 - Duce Staley, 325 attempts in 16 games
2000 - Duce Staley, 79 in 5 starts (252.8 in 16)
2001 - Duce Staley, 166 in 10 starts (265 in 16)
2002 - Duce Staley, 269 in 16 starts
2003 - Westbrook, 117 in 8 starts (234 in 16)
2004 - Westbrook, 177 att in 12 starts (236 over 16 games)
2005 - Westbrook, 156 in 12 starts (208 over 16 games)
2006 - Westbrook, 240 in 14 starts (274 over 16 games)
2007 - Westbrook, 278 in 15 starts (296 over 16 games)
2008 - Westbrook, 233 in 14 starts (266 over 16 games)
Here's the thing that you start to notice about Andy Reid looking at the data. His main RBs project to about 63% of the total carries * 414 carries, or 260.
However, there are some years that really stand out. These are:
1999 - 76% of carries to main RB
2007 - 70% of carries to main RB
Looking at those two years, these were the years that there really wasn't much of anyone to give carries to in that offense. In 1999, it was completely the Duce Staley show, and in 2007 Correll Buckhalter had been reduced mainly to a kickoff return guy, and they didn't have anyone else.
I feel like that's pretty comparable to the Chiefs this season. They have Charles and a bunch of nothing.
So, taking that into consideration, let's go on the low end of around 70% of carries to the main RB. In this case:
70% of 414 = 290 carries.
Over that timespan, the floor/ceiling/average at 70% of carries (given total carries) would have been:
Floor: 70% of 365 = 255 carries
Average: 70% of 414 = 290 carries
Ceiling: 70% of 489 = 342
I certainly don't think he'll approach that 342 number (after all, Duce Staley's 325 is the highest one's gotten), so I feel that 489 carry season is more of a fluke. If we get rid of that outlier from both the average and the ceiling and go with the 2nd highest total of 427 we get:
Floor: 70% of 365 = 255 carries
Average: 70% of 406 = 284.2 carries
Ceiling: 70% of 427 = 298.9 carries
I'd argue those numbers would be pretty close, and would then project Charles at 284 carries, about 24 higher than what footballguys has him at.