I think the argument isn't if the camera has a better image for you, like in photobooth, it's: does the camera produce a better image for the person on the other end of a multi-participant video call?
We've discussed that most people's argument for wanting a 1080p camera in their mac isn't because they're making youtube videos for it...
So with the c920 - does the massive video compression applied by services like Zoom and Teams allow you look any better (not just different) than using the built in Mac's camera?
Yes. It demonstrably does, in FT, Webex, and Zoom.
I have been told outright, and without soliciting feedback, that my video "looks better," and broadly speaking my interactions aren't with a technical audience.
The extent to which the user or viewer care, will vary by user and viewer.
External webcams will always beat internal webcams.Light, optics, better sensor...
I switched from a C920 to the Avaya HC020 and I noticed an improvement in low light performance plus I can digitally pan and zoom with a remote which is helpful. This is because it captures in 4K and then crops for 1080.