Difference between the History Brush and the Erase to History in Photoshop CS5


I'm currently going through the Photoshop CS5 Missing Manual and near the beginning I came to a question I hope to be answered.

What is the difference between the history brush and its history panel compared to the erase to history?

The book goes in depth about using the history panel and how to use the history brush to get the results. Then, in the blue box titled "power users' clinic", they talk about using the erasing to history option.

After reading the box both of these options seemed like they do the same thing? Do they really? Or does one do a better job for certain things?

Any help would be greatly appreciated.
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