If you tend to spam keys in WoW/etc, which it seems most WoW players do, I'd avoid the blues... The release point on them is higher than the activation point, so you have to basically completely let off the key to keep spamming it. It's less of an issue for games you don't mash on a single key, and some people fully release anyway, so some people can game just fine on blues, but I know I personally had issues with them.
I think the poll here had roughly 1 in 6 people with issues gaming on blues, but I'm not sure offhand. It's really best if you can try them both yourself, but that's not an option for most people. Blues and browns will both bottom out harder than a rubber dome board, there's nothing to cushion them, but it's not bad for the keys, slam away.