There many different types of handheld scopes. There are scopes that use polarized light or standard LED light. There are scopes that allow to toggle from polarized to non-polarized mode. Some scopes can also be attached to a camera (smartphone / tablet).
It is the author's preference to use scopes that allow toggling between polarized and non polarized light because it provides additional information. When asked which scope is most recommended, the author's answer is - Try it out, hold it in your hand and see which ones feels best for you.
Here are some examples of handheld dermatoscopes that are currently on the market:
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