Published at LXer:

Operating systems are like cars: you can get a power-hungry Humvee that guzzles gas, leaving you with a few miles to drive, or you can get a super-efficient smart car that barely sniffs gas and gives you hundreds of miles of range. You can also get a monster OS that devours all system resources (CPU and RAM) or you can choose one that barely sips resources. The only difference between cars and operating systems is that lightweight operating systems, unlike lightweight cars, can do all of the heavy lifting that a Humvee can do.

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Knoppix, Lubuntu, Pixel, Arch, Remix, Debian, Puppy.

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No mention of NetBSD, Tinycore, Damn Small Linux, Slitaz, or Ttylinux

I can never take these seriously when they don't include AntiX. Not only is it incredibly lightweight in X, it's also systemd free. And in distrowatch's reviews, it's as of this momoent averaged a perfect 10.