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The Revised also has an introduction from King that the original didn't.

I really don't think King should revise the rest of the series. It would be George Lucas and his "special editions" all over again.

I think the concept of revising DT1 to make it more accessible...

I have to disagree with you on that because the number 19 makes no sense at all in the Gunslinger when taken in greater context with the rest of the series.

In DT1, 19 was the word that unlocked...

Off the top of my head, the inclusion of the Crimson King, Walter's identity crisis and the addition of "19" absolving Roland of his role in Allie's death all come off to me as being pretty big...

Original.

The original is harder to read and the revised is more accessible, but in the end, most of the changes were either pointless or ended up confusing the series' continuity more than it...