>>13211537Kanto has a greater story due to the strong rivalry and the accomplishment of taking down a criminal orginization actually threatening something.
Kanto's music is far superior to that of any other gen. One needs only to listen to
http://www.youtube.com/watch?v=7bRctqZpTM8 or
http://www.youtube.com/watch?v=ptXXzQ_dXwg to realize this.
Kanto is the most nostaligic for a fairly easy reason. It literally created Pokemon as we know it today, and as such holds fonder memories for a larger amount of people.
And finally, Kanto is the most replayable because of its ability to Nuzlocke and tough but fair level curve.