There are three different versions of Minecraft, they are the PC, Pocket edition, and X-box 360 versions.
pc
The PC version was the first of the versions to come out, it was released on the May of 2009. The PC version is newest things updated. The PC version has more than the Pocket edition and X-box 360. The PC version was a big hit when it came out. It was originally created by Notch, then Mojan took over it. Minecraft on the PC has all sort of things to do, it has Hunger games, Hardcore, Creative, Survival, and many more. the version is to be continuously updated.
X-box 360
The X-box 360 version is the best in my opinion. The X-box 360 version came out the May of 2012 according to wikipideia. I think it is the best because of the controls and even though it is not as updated to the PC version that, Mojan, Notch, and Microsoft can see what they want to change then what they did with the PC version so by the time it is updated with the PC it will be better. The X-box 360 version has many features that the Pocket edition does not. The version has many stuff to build and interact with and will have more every so often.
The pocket edition
The pocket edition is played on iPads, iPhones, and Androids. The Pocket edition is the moblie way to play Minecraft, it came out the October of 2011 according to Wikipideia. The Pocket edition is the last to be caught up with the updates to the PC version. Unlike The X-box 360 and PC version, you can not switch between Creative and Survival worlds. The Pocket edition has the smallest sized map, does not have portals, and has the least amount of different objects in the world. The Pocket edition has a unique way of game play.