I think a binocular is important for a 3D view when we must operate with a solder iron for example. Try to solder while closing 1 eye : not so easy. So, I'm not convinced by USB camera.
Large vision size is also important, it's better if you can see all of your tqfp as only 4 pins. Magnification around 9x is sufficient.
I have an Olympus SZ30 I really like. Time to time I use a Leica GZ4, quite similar but I prefer the Olympus : more space under the Olympus for same magnification (distance and size of lens support).