alt Hacker NewsDSL is much older, and the original version came as a 50MB disk image.
Current version clocks in ~700MB, again very small when compared to any modern Linux installation media.
On the other hand, it seems like DSL takes a more extreme approach to slimming down i3/XFCE route, plus DSL contains Dillo which is arguably the latest modern-ish (to the most extent possible) and lightest browser in existence.
I still remember burning the dsl livecd image to a mini-cd shaped like a credit card (edges trimmed off) and using it on university workstations.