It is not for no reason the world is getting rid of manual registers and replacing them with digital and automated registers. For starters, manual registers are nothing but ink and paper. They are physical items that not only take space but require human effort and environmental destruction to be created.
An assumed and an unthought-of answer to the question would be an easy yes. How difficult could maintaining a notebook register be? If you want an honest answer, then please ask your security guards or even better, take the budget of your manual visitor management system and compare it with a company that has digital visitor management system.