Cmmotionmanager
Use for questions regarding CMMotionManager objects; an NSObject class in the Core Motion framework and MonoTouch.CoreMotion Namespace.
Uiaccelerometer
The UIAccelerometer class lets you register to receive acceleration-related data from the onboard hardware
Others
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Basically it seems like cmmotionmanager is much larger and slower than uiaccelerometer is from question CMMotionManager vs UIAccelerometer efficiency |