Product selection for angular detect application

Hi,

Our product is designed for wearable application. One important function is angular detection. Please find the detail requirements as follows.

1. Detect angle in Z-Y and Z-X direction.
2. Sensor chip will be placed in vertical direction.
3. Angel measurement tolerance need be less than 2 degree.
4. Measure angle data every 1 minute not all time due to power saving

Which invensense MEMS sensor is most suitable for above requirements? Gyro, Magnetic or Gyro + Magnetic?

Please give me your suggestion. Thanks