Slackware actually has an infinite amount of BoB. Its slackfullness is beyond comprehension. Arch probably has some BoB squirreled away in hidden places, they just don't realize it.
Well, Arch: 1 Slackware: 1
or actually I'm running a server as Arch (besides a bunch of Ubuntus), so could be Arch: 2 Slackware 1