BIAS INCOMING: If you spend a lot of time typing try and get something other than black or red. You know what, if you use your keyboard at all, just use something other than black or red. The linear switches just don't feel good to type on in my opinion, or game on. go to keyboardco.com and buy a filco with browns or blues. Some people like linear switches, but wow, I really can't understand it.
UNBIASED THOUGH SLIGHTLY BIASED OPINION: I have owned reds and my friend has blacks, so I have used both a decent amount. I like reds more because I like a lighter switch. If you think you want a slightly heavier switch, get the black.