使用加速度计或陀螺仪计算步数

I am developing an application to count the steps of the user while putting the phone in the pocket of his pants. And I need to know which is better to use, Should I use the accelerometer Sensor or the GyroScope sensor. Also I have tried the accelerometer sensor, and it worked but I'm asking to check whether the GyroScope is more accurate to this function or the accelerometer? Thanks in advance for help.I am developing an application to count the ste