Fantasy analysts don't always get along. They don't always agree. And while our algorithms spit out some amazing projections each and every year, we're bound to disagree with the computers at times.

Insert the fantasy football roundtable, where the football guys here at numberFire are able to disagree and argue for a particular player or ranking in fantasy football. The topic for today: Who should be the number one running back in fantasy football?

The Argument for Jamaal Charles

From Drew Lieberman

If you have the first overall pick in fantasy football this year, Jamaal Charles should be your choice.

Charles tops our FireFactor rankings, which uses a playerâ€™s projected point total against the value of a replacement at the position. In a standard scoring setting, Charlesâ€™ FireFactor number tops 235, over 15 points higher than second-place LeSean McCoy and over 40 points higher than Adrian Peterson. Just know that our computers love him.

Charlesâ€™ career began in 2008, but he didnâ€™t break 70 carries in that season, so his real usage began for all intents and purposes in 2009. Conveniently, that was LeSean McCoyâ€™s rookie year, and Adrian Petersonâ€™s third year in the league, so the numbers of all three can be compared pretty easily since 2009.

Name Total NEP Total NEP RB Rank Rushing NEP Rushing NEP RB Rank Jamaal Charles 192.34 2nd 83.63 1st LeSean McCoy 172.47 3rd 58.12 2nd Adrian Peterson 109.91 8th 50.59 3rd

The above table looks at our Net Expected Points (NEP) metric as well as Rushing Net Expected Points (Rushing NEP), both of which help determine how a playerâ€™s performance impacts his teamâ€™s final score. As you can see above, since 2009, Charles leads the three running backs in both categories, despite missing most of the 2011 season to an ACL injury. With a healthy 2011 campaign, there's not much reason to think Charles wouldnâ€™t be significantly further from the pack.

With Andy Reid still the head coach in Kansas City, I think Charles could very well perform at a similar level as last season in which he amassed the third-highest point total by a running back since 2009, while only participating in the teamâ€™s first 15 contests.

A big reason for this was the offenseâ€™s reliance on Charles inside the opponentâ€™s 10-yard line, where Charles totaled 14 of his 19 total touchdowns on 32 touches. When comparing this to his six touches inside the 10 in 2012 and 12 in 2010, it's clear that he's more of a focal point near the end zone than he was before Reid arrived in Kansas City.

But why I think Charles can provide value that McCoy and Peterson canâ€™t is ultimately his contribution to the passing game. Last season, Charles set career-highs in pretty much every receiving category. He had nearly as many yards receiving as McCoy and Peterson combined (693 versus 710), over double their receiving scores (seven versus three) and now McCoy has Darren Sproles to compete with on third downs and for passes out of the backfield. Five of Charlesâ€™ touchdowns and nearly half of his yards came from passes outside of the backfield, and with the football in his hands, he's a threat to score from anywhere on the field.

Charlesâ€™ role in the passing game provides him a high floor that the other two backs donâ€™t necessarily have, especially in PPR formats. Even if his carries take a dip, Charles is still going to produce elite numbers. No disrespect to McCoy or Peterson, but a healthy Charles will be the best fantasy running back in 2014.

The Argument for Adrian Peterson

From Brandon Gdula

I'm not afraid to take on the challenge of suggesting that Peterson should go first overall. Jim Sannes did a good job discussing why Peterson may be fade-worthy this season, but every back in the discussion has some question marks. Every player does.

The main issue with fantasy backs is regression. It's not often people are willing to vault unproven rushers into the number-one discussion, so it's not a surprise that the two prime candidates are Charles and McCoy, two guys who have track records of being near the top of the fantasy leaderboards.

However, top-level fantasy production can come and go and never come back. That's never been the case with Peterson, even during his down years. Sure, Peterson has had his struggles from injury and from poor supporting casts, but he's never failed to place outside the top eight at running back in seven years.

Three of his seven seasons were good for first or second. That's absurd.

He's also been able to produce elite Rushing NEP marks as well. He finished second in 2011 and first in 2012 in the metric. Aside from finishing 33rd in 2009, he's never finished outside the top-18 in his career, and 4 of his 7 years were top-10 Rushing NEP finishes.

The point is, all backs regress to an extent, and Peterson's steps back have only been temporary. Charles could repeat as the top fantasy back, but history isn't on his side. Here's how the top fantasy backs fared in subsequent years. The drops don't deem former-number-ones useless, but repeating as number one is optimistic at best.

Season Fantasy RB1 Points Following Year Pts Difference Rank 2012 Adrian Peterson 307.4 203.7 -103.7 8 2011 Ray Rice 298.8 222.1 -76.7 6 2010 Arian Foster 327.0 250.1 -76.9 4 2009 Chris Johnson 345.9 229.9 -116.0 5 2008 DeAngelo Williams 285.6 177.9 -107.7 14 2007 LaDainian Tomlinson 307.6 224.6 -83.0 6

Fourth is the highest a back has been able to achieve after leading backs in scoring. So while scoring leaders dip, others have to take over. And the runner-up doesn't get to snag the crown the next year.

Season Fantasy RB2 Points Following Year Pts Difference Rank 2012 Doug Martin 262.6 56.2 -206.4 58 2011 LeSean McCoy 281.4 145.3 -136.1 22 2010 Adrian Peterson 240.9 187.9 -53.0 7 2009 Adrian Peterson 282.8 240.9 -41.9 2 2008 Michael Turner 273.0 146.6 -126.4 23 2007 Brian Westbrook 280.4 215.8 -64.6 10

Peterson owns the two smallest drop offs of the 12 top-two backs in the sample, but also owns a tangible decline last year, in fairness. But since we're being fair, he missed two games and would have been top-five last season, and dropping 74.6 points from his league-leading 2012 season.

That would give him three of the four smallest declines out of the 12 backs in the sample. You can cite his age and his injuries and his sub-par teammates. But regression is real, and Peterson is the least affected by it of anyone (thanks to his 10-plus touchdowns every season), which is why I'd draft him all day over Charles and McCoy whose quest to the top in 2014 would be quite historic.

The Argument for LeSean McCoy

From Daniel Lindsey

You want to judge a running back by how he's used, right? You want him to get enough carries to make a difference, and a few receptions out of the backfield doesnâ€™t hurt either. Take a glance at the table below to see how Shady, Jamaal Charles, and Adrian Peterson were all used in 2013.

Rushes Rush NEP per Rush Success Rate Receptions Reception NEP per Target Success Rate LeSean McCoy 314 0.12 51.30% 52 0.49 81.3% Adrian Peterson 280 0.03 40.36% 29 0.21 72.50% Jamaal Charles 260 0.05 46.15% 70 0.53 67.14%

McCoy didnâ€™t just outrush both backs, but did it more efficiently as well. He had over 300 rushing attempts for the first time in his career, yet still destroyed the other two rushers in Rushing NEP on a per attempt basis. And we should expect that to continue with Chip Kellyâ€™s offense. Charles, on the other hand, had over 70 receptions (on 104 targets) with Andy Reid at the helm. While I still think Charles could catch a lot of balls this year, that's quite a jump in just one campaign with a new captain. McCoy has averaged 58 receptions per season over the last four years, whereas Charlesâ€™ never had more than 45 receptions before last season.

Another thing to point out is the fact that McCoy's Success Rate both on the ground and through the air a season ago trumped the other two runners. This measures the percentage of rushes or receptions that contribute positively towards a player's NEP, which is a clear sign of consistency. McCoy wins that debate.

Charles may not regress in receptions, and Peterson could even see an increase over his usual 29 receptions per year with Norv Turner. But thereâ€™s no denying the fact that, of the running backs considered to be the top ones overall, it's LeSean McCoy who has done well consistently both on the ground and through the air through the years. That's why he should be the first running back selected this year.