You can’t have a videoconference if the person on the other side can’t hear you. There are many different variables that can affect the audio on your side of the screen. A microphone attached to a computer may be too far away and/or pick up too much ambient sound. A microphone in front of a speaker could pick up rustling papers and is only able to cover one or two people at a time. Ceiling speakers hanging from the wall can only cover a certain amount of area. Consider the space that your videoconferencing will take place within, and choose accordingly.
Product shown is FLX UC500 Speakerphone by Revolabs