Purple has been my favorite color ever since I was a kid. I think of it as a neutral color, since it's a combination of red and blue, but it's not as harsh as either. I think it defines me, somewhere in the middle of warm/cool.
When it comes to a choice, I choose red (like when I got my 3DS; there wasn't a purple option, so I got red).
I don't really like to wear either color though; I don't think they look good on me. I'll wear them if they're not the dominating color (like my sweatshirt is black with red trim).