Difference between Timer Edge detection and GPIO edge detection on ARM micro

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Kaleborg

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Hello,
In my project I'm using LM3S3748 ARM chip. I must be able to capture the falling edge of a signal running at 2.5 - 5MHz and then generate interrupt. My question is what would be better/easier to use and what is the difference between these two methods. As I'm looking at the datasheets both methods seem to be doing the same thing.

Thanks in advance.
Regards
 

the timer interrupt - signal's pass thru and detect by the micro by a certain time while the GPIO interrupt is when the micro detect a higher signal not equivalent to a reference thus the interrupt executed.
 

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