One "coin" USB scope and one "student" version in my experience, leads me to say: They are all the same and not useful for photography. Any smart phone or any real digital camera will be vastly better to capture an image of a coin. Almost any phone or camera purchased in past 5 years will be an order of magnitude better.
A really useful tip I heard recently is to put a recent cell phone on highest resolution setting, put the phone atop a "pint
glass" and use the phone's voice command settings to trigger the photo.
The USB cameras might (unconvinced/unconfirmed) be able to show a scratch vs a double-die vs
smoothing.
But I have found them nearly useless compared to other options properly set.