I see it this way - blues for accuracy, browns for mixed accuracy/stamina, reds for stamina, blacks for speed. The tactile feedback on the blues allows you to control it better, same goes for browns but they have less resistance so they are a bit better for stamina. Reds have almost no resistance compared to other switches so they are great for streaming long periods of time. The stronger spring on the blacks helps reset the switch back to its default state quicker letting you stream faster, but a stronger spring means it harder to stream for a long time like reds.
In the end though it doesn't really matter. A switch plays a very small role in how well you do in this game. If you can't try a switch out, just pick whichever. There are plenty of amazing players who play with all different switch types. rrtyui uses blues, staiain uses browns (super fast streamer), thelewa uses reds, and jesse1412 uses blacks.