Its arguable more important for you to have crisp, clean, audio than it is to have a good video feed when presenting. For most people who are individually contributing in a conference call, a USB microphone is the way to go. One exception is if you are using your smartphone to connect to the meeting anyway. I’ve found most modern mid-high range smartphones do a decent job of handling audio in conference meetings provided there is a good reception, and the application supports higher quality audio. I use Gotomeeting frequently, and the call quality on that isn’t great most cases when calling in, but when connecting using VOIP its decent in the call but horrible in recorded webinars/meetings.
As with most things audio, you get what you pay for. However, the closer you can get the microphone to your mouth, the better overall quality you can expect. So a microphone up close at under $50 is going to beat a microphone a foot away from you at twice the price just about in any situation.
Best USB Microphone today in November 2020 for voice, is the Shure MV7.