The exact type of LED driver you need depends on the specifications of your electronic components. Larger drivers are suitable for applications such as televisions, while smaller drivers are suitable for applications like smart phones. You also have to consider the weight of the driver. You don't want a heavy driver for an electronic application that is handheld, such as a handheld video game.
You have to determine the type of current you need. LED drivers are available in AC/DC models or DC/DC models. An AC/DC LED driver is the more efficient of the two. It is suitable for applications where dimming of the light is desirable. A DC/DC LED driver is best used for wide-input and output ranges in a variety of applications.
Another consideration you must think about is the control module for the LED driver. You can option to use a microprocessor or a one-wire control, depending on your application. The microprocessor option gives you a little more control over the function of the driver, but the one-wire control offers a compact solution for micro-applications.