There are many kinds of LED strips, but in fact there are only four factors you need to consider about :
it's the first look at the LED strips, you will see the materials, water-proof and style.
It's LED SMD 5050 or LED SMD 3528. The 3528 is smaller than 5050.
How many LED lights elements in one meter. There are 60 LEDs/meter, 78 LEDs/meter, 120 LEDs/meter.
It's the most important. Insert the plug to see the LED strip is blue, amber, warm white or cool white.