I've had experience with SLAX, Knoppix, Slackware and am currently running SUSE on my laptop (after I screwed it up with windows/HP lol

). If I had to choose out of those four again I'd definitely stick with SUSE, it offers all the software packages that come with Slackware only I found it
much easier to install plus, configuring it for compatability with all my hardware was a breeze.