More recent cameras with Hardware-Based Autofocus have improved greatly with more responsive and smoother adjustments.
Look for smart, thoughtful design in the camera itself: A webcam clip and mounting design that's versatile and adjustable when perched atop or clipped to a laptop or notebook screen, that can sit on your desktop or monitor, or those that have a standard camera mount hole for attaching to a tripod.
For MOST people a simple, hassle-free, futz-free fixed lens cam may be your best straight-forward choice.
Looking for a wide-angle UVC web camera appropriate for multi-party videoconferencing sessions?
These high quality webcams are designed for group conference sessions and offer a slightly wider FOV - Field Of View.
These discontinued software-based focus cameras from Creative Labs, HP and Logitech simply perform like a fixed-focus model on Mac OS and Linux.