Resolution, fps, sensor size, HDR, FOV — what each one does for your picture.
A physically larger sensor gathers more light, which means a cleaner image in normal room lighting. It's rarely on the box, but it's why some 1080p cams look better than others.
High dynamic range balances bright windows and shadowed faces. Useful if you can't control your lighting.
4K and 60fps need USB 3.0 bandwidth. Plugging a high-end cam into an old USB 2.0 port silently caps your quality.
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