SLY
Mr. Knowitall
Which Guinness? Foreign Extra is AWESOME. Draught is garbage. But they're not the same class of Stout.
Stouts are broken into 6 categories, Oatmeal, Dry, Sweet, Foreign Extra, American and Russian Imperial. They are different for various reasons. For a detailed breakdown of the different styles, go here: BJCP 2008 Style Guidelines - Index
Murphy's is a better dry stout than Guinness Draught (in my opinion). Young's Double Chocolate is pretty much the best stout ever made (again, in my opinion). But also try Sam Smith's Oatmeal and Imperial Stouts, Old Rasputin, Black Obsidian, and Left Hand Milk Stout.
Breckenridge Oatmeal Stout is pretty bangin'.