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adxrs642 or Adxrs646 is better for AHRS?

Hi,

The adxrs642 and Adxrs646 are low price gyroscopes. i'm confused to choose one of them for my IMU/AHRS!!

the ADXRS646 have better performance(12°/hr bias stability) but ADXRS642 have more better temperature stability.

also in ADXRS646 data sheet Application did not mention IMU!

please somebody help me ;)