Relay vs. H bridge

I would like to ask which driver is better in manufacturing (for motors) R.O.V H bridge or relay ? why ?

A motor controller is a device or group of devices that serves to govern in some predetermined manner the performance of an electric motor. The switch may be manually operated or may be a relay or contactor connected to some form of sensor to automatically start and stop the motor. Theory of Operation of motor controllers can be manually, remotely or automatically operated. They may include only the means for starting and stopping the motor or they may include other functions.
further operations for the electronics equipment controlling I’m not recommending but perhaps you could check out this link "operations(operations)":http://actpcb.com/blog/ for to know about project work.
Thanks!!!

H bridge would always be better depending on of course your application bare in mind that H Bridge can be pwm controlled meaning variable speed ,reversing of motor etc plus of course these days we look for solid state control to avoid mechanical switching less mechanical in some cases not all means we have supposedly less to go wrong although you could argue this extensively As far as reliability is concerned with modern day semiconductors H bridge tends to be very reliable In high voltage applications this might be extensively different

For robotics H bridge is the ideal answer since we have far more control over torque motor speeds and more obviously its all CPU controlled

Typical applications also now include class D audio although not for motor control

H Bridge is now used extensively in class D amplifiers since the heat factor is negligible more power , more efficiency less heat , more reliable , less components

Other applications include wheel chairs, mobility scooters lift mechanisms for stairs etc etc for people that have mobility problems More control , safer , low voltage applications higher torques

Also you can slot into this milling machines , plotting machines printers etc etc Lots of everyday equpment uses H bridge control

Plus bare in mind Its purely software controlled hence design is far more secure This is also advantageous when it comes to network controlled devices since we are only dealing with data over RF , hardwire or infra red Make sence to keep it all the same protocol

As John says it depends entierly on your application

I agree with you mark that H-bridge would surpass Relay in many applications (High Frequency Switching applications) but when it comes to dealing with power hungry motors or any other devices which requires large current to operate (Frequency of switching is less) then Relay comes to rescue.
In short using anyone of the above depends on the application.
Hope it Helps!!