When choosing between doorbells and door knockers, there are several things that you should keep in mind that will help you to make the better decision. If you have little kids or babies, you might want to choose door knockers so that when the bay is sleeping or resting, someone coming over will not disturb or wake them up. Door knockers are a better option because they are quieter, but loud enough that they can be heard from in the house.
When your kids grow up and start becoming louder, you might want to switch your door knockers to door bells so that you can hear when visitors come. Door bells are loud and can be heard at any point in the house. There are many door bells that even have a unique chime so that when visitors come, they can hear the different and unique chime.
One of the best things about door knockers is that you can have them on the door for decoration if nothing else. So when your kids grow up you can keep your door knockers and also have door bells. Choosing between the two is ultimately up to you, but there are some options that will be a better choice realistically.