Facebook Messenger is one of the most popular messaging apps on the planet. We know that a lot of people don't like the app. We agree that it still needs a lot of work. However, there are so many people that use Facebook that Facebook Messenger just makes sense. The video chat experience works relatively well. Since most of the people you know are on Facebook, it's easier to use this app than to convince everyone to join a new platform. Plus, the new ads rolling out aren't great. It's not perfect, but it's perhaps the most convenient of the video chat apps on this list. At least it's free.
For presentations, screen sharing is important as are granular options such as the ability to share just one application (Microsoft PowerPoint, for example), document, or image or share your entire desktop. Most of the video conferencing services in this roundup also offer a whiteboard tool, which you can use to sketch out ideas or take notes during the meeting for everyone to see. You also need to consider what the participants are able to do, such as share their screen, enable their webcam, sketch on a shared whiteboard, and even take over the presentation. Think about how much actual collaboration you'd like in your meetings.