Processor ADC rate setting 96K versus 192K?

Try both a few times and see if you hear a difference. If so, pick the one that sounds better to you.

Any audible differences between ADC at those rates are more likely due to differences in implementation (circuit quality) than due to intrinsic properties of the ADC resolution itself.

If I heard no differences, I'd be inclined to go with the higher rate.

In the old days, hi resolution recordings sounded a lot different, due to DACs performing much worse with low res (44.1kHz/16 bit) signals.  New DACs are a lot better and you are really just playing with the response of the top octave.  I personally can't hear a difference after 96 kHz.