Well yes, there do seem to be too many types to choose from first of all. But remember that most are just named after where you might put them. The term outdoor fairy lights is really an all-covering phrase. So there may be outdoor patio string lights, deck lighting, Christmas outdoor lights, and more, but they come into the same group. String lights and fairy lights really just describe ways of arranging fairy lights outdoor to suit situations. The real choice comes in how to power them.