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Hi,
In ADC selection, there are two major considerations.
First is the frequency and bandwidth of you input signal and second is the output resolution in bits.
For example, audio sampling requires low frequency (20Hz ~ 22KHz) and high resolution (usually 16bit or more) and then you can use a lowpass sigma-delta ADC, for instance.
On the other hand, you might have a sensor that outputs a signal of bandwidth 200MHz around a center frequency of 1GHz and you need 4-bit resolution. The you can use a bandpass ADC with a low output resolution.
Hope this helps.
p.s. I'm guessing you're not designing the ADC yourself, because then this warrants a whole 'nother discussion.
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