Hi,
Thanks for your inquiry.
The tap interrupt engine inside BMI270 and BMI323 is the same. It has single-tap, double-tap and triple-tap interrupts. BMI323 is easier to work with because it doesn't require to download the 6KB configure file after power on like what BMI270 does. So you may go with BMI323 for your project.
In terms of reliability of tap interrupt, the main goal is to make sure BMI323 can output interrupt signal when real tap event happens. You can fine tune some parameters to achieve that. However, tap interrupts may be triggered by other motions such as vibration, friction of your device on a surface, etc. You can ignore those false positives as long as you don't miss the real tap events.
Thanks.
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