Slackware is the true Unix of Linux distros

(subject is quoted from the vector linux website with the small edit that I replaced "distributions" with "distros" to fit in the character limited subject line)

What exactly does that mean? More importantly to me, how does slackware differ from normal linux distributions? What differences will I see?

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I was thinking of using it for my bittorrent downloadings (would need java and azureus), shared file server (would need samba), and having kaid (xlink kai) wouldn't hurt. Then just leaving it on 24/7.

Is slackware good for what i've mentioned?