Hard_Configurator is also based on SRP like AppGuard. The advantage of AppGuard lies in Guarded Apps feature (kind of the light sandboxing), so generally, the similar level of security can be applied by AppGuard with fewer restrictions. AppGuard has also the convenient and informative logging feature - Hard_Configurator uses only information from Windows Event Log, that sometimes is rather sketchy.
In the actual form, Hard_Configurator is intended for advanced users. After adjusting the restrictions to the concrete software/hardware setup, it can be used by inexperienced users as a semi-locked security solution.
Hard_Configurator uses only Windows built-in security features + forced SmartScreen (no 3rd party drivers), so the setup is very light, stable and compatible with Windows.