Airport Express supports dual-band. Airport Extreme supports simultaneous dual-band. What's the difference?

What is the difference between the two. And which one would be better for extending my wifi signal for my ipod touch
http://www.apple.com/wifi/

Hi Joel,
Simultaneous dual band = can process signals on both bands concurrently.
dual band = can process a signal on one band at a given time,  either or.

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    Alvaro

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