What is the difference between the sliders and the 5-star controls?

Only the visual representation and the way you can use it. All the rating values range from -100..0..+100. Sliders show a red background for values < 0, a gray (empty) background for the value 0 and a green one for values > 0. A 5-star control shows up to 3 red stars for values < 0, 3 gray stars for the value 0 and 3..5 green stars for values > 0. When you click on 1 star, you rate with the value -100, two stars -50, three stars 0, four stars +50 and five stars +100. So you can use the 5-star control for a roughly rating to start with and, if needed, the sliders for fine tuning.