Can you remove a flash hider?

If the muzzle device is a flash hider (like an AAC 51T], for example), or omnidirectional (like this Q Cherry Bomb), simply screw it on with the appropriately-sized wrench (a torque wrench is preferred so you know how many foot-pounds you’re tightening it) or ratchet depending on the mount.

Is flash hider better than muzzle brake?

The thing is muzzle break gives over all less recoil and less recoil for longer than the flash hider, compensator gives better vertical recoil so it is better to control with compensator. In my opinion the muzzle break and the compensator are better overall than the flash hider.