Switch Difference:
Blue Switch: Blue Switch can offer quicker and springier response, crisp click sound for spring Typing enjoyment, precise tactile feedback for ultimate Gaming performance.
Brown Switch: Slightly quieter and easier to trigger than the Blue Switch. Halfway between a Typing and a Gaming Switch. Some people prefer Brown Switch since it enables you to Double Tap faster and typists like them because they still have a good Tactile feedback, but the audio feedback isn't quite as noticeable as Blue Switch.
Red Switch: Linear Switch, meaning that the force at the beginning and the end of each stroke is nearly identical. The result is a feel that most perceive as smoother and faster making them especially popular among Gaming enthusiasts. Red Switch is the best fit switch using in Office.