I think he was referring to the switch type, not the colour of the key caps themselves or backlighting. The switch is what actuates under key press and sends a signal to the computer.
Cherry MX switches come in different colours, each color being a different type of mechanism. This means that a certain switch, say Cherry MX blue switches, are loud and clicky whereas the brown switches might be quite but require less force to actuate.
This is a Cherry MX red switch -
Compared to a Cherry MX blue switch -
Almost every mechanical keyboard that you buy these days will feature Cherry MX switches, unless you get an old IBM keyboard or something that might have a buckling spring. There are quite a few different switches, red, blue, black, brown, white etc. each having different characteristics and a different feel to use.
If you do actually have cherry MX red switches and you know this then completely disregard what I just said haha.
Well I have a razer anasazi and I enjoy it, it's loud but most definitely comfortable. But I can't say anything about the corsair because I don't have one for personal use. My brother has one and he begs me for my razer keyboard, so thats just something. Plus if you enjoy colors idk about the corsair but thee razer products can change.