Don't choose an MX black board for serious typing. IMO the switch is only a little better than a rubber dome for typing. And the mechanical keyboard guides MX blacks for gaming!!!1! thing is overrated. They aren't anything too special...
I vote MX blues UNLESS you type a lot at night in a building where people can hear you.. Most people have no trouble gaming on them.. They are fantastic for typing.
I like typing on my blacks... and gaming on them