Real life is not that simple. Many times, graphs and charts (especially when they replace actual numbers) can be misleading, even unintentionally. In this article, you could focus on IOPS, if your target workload is sensitive to that. Or you could think about maximum bandwidth, or number of rack units required, or the fact that one of the options requires special drivers and multiple PCI-e channels, and so on. Just throwing a graph up would hide a lot of useful information, and encourage knee-jerk reactions to the article. We all know from the Megahertz Wars that this isn't good for anybody. Pretty graphs have their place in pop-tech pieces, but this article was more useful in just two pages than most of those articles are in ten pages of graphs.