If you want a webcam that'll do the job well for years, get a C920.
Logitech has released follow-ups to the C920 in the last few years, but it's a tough model to improve upon. Unless you really need 4k capture, or 1080p @ 60 fps (C920 tops out at 1080p @ 30fps, or 720p @ 60 fps), this is about the best model out there from any manufacturer. Since C920's have been out for years, they can be had pretty cheap (new or used), and with a Windows machine they're plug-and-play. I have no experience with MacOS (nor do I ever hope to).
I have 2 of these; one that is a Carl Zeiss model and one that's a standard C920. I've never compared them, but I can tell you both work great. Logitech's free "Logi-Capture" software is outstanding also and works seamlessly with these models. If you need a web cam and want one that will do the job well for years, get a C920.
Verified purchase: YesCondition: Pre-owned