Should you choose Razer Blackwidow Chroma or Corsair K70 RGB for the best bang for the bucks? See the comparison below for the answer. However, there are also several differences that set Razer Blackwidow Chroma and Corsair K70 RGB apart from each other. They both offer a programmable backlight system that allows you to customize specific color schemes for different games. These two gaming keyboards are available in a similar price range. Both Razer and Corsair are well-known manufacturers of gaming peripherals, and those great companies continue their competition with Razer Blackwidow Chroma and Corsair K70 RGB.