The main tip is that the solar security light should be high end - don't cheap out. You want bright light that will last all night every night, even through a few days of clouds.

I would recommend that your solar security light has the solar panel and light separate (ie connected by a cable) that way you can always ensure that the panel is positioned in an optimal manner. 

When buying solar-powered lights, make sure that they can satisfy your requirements for providing a decent amount of light and keeping your place safe and secure at dusk. Think about where you’re going to place the solar lights, and consider if you prefer options that can add some embellishment to your outdoor space.