My brother and I each have a Switch. We both got the Blue/Red one because we like colors. But it got annoying trying to tell them apart so I bought a set of Pink/Green Joycons. I bought it mostly for the Green one cause I like Blue and Green as a combo. My brother decided he wanted the Pink one so he has a Pink/Red combo on his Switch.

He discovered that the color of the JoyCons on your Switch in game are the same as the ones on your machine. Which I thought was a cool little detail