I have nostalgia for my late-teens early 20s cartoon consumption. I was still watching Batman:TAS and the 90s Spider-Man series. There were flashes of high-intensity (if not well told) brilliance from the 90s Real Adventures of Jonny Quest series. I have to admit, the CGI they used was not as well executed as Reboot. Darkwing Duck, Peter Pan and the Pirates, and Gargoyles were shows what I looked back on fondly.
Daria, Clone High, and Ren and Stimpy all made an impact on me as a young adult. Daria, for its sardonic, anti-establishment stance. Clone High for its mockery of sitcoms and rom-coms and teen angst. Ren and Stimpy for pushing everything past its limit.
In the end, though, it was Samurai Jack and 90s X-Men that stood head and shoulders above them all. X-Men because it was what I collected and knew the best. Samurai Jack because it was cinematic, well- paced, and offered me something that no other TV show, movie, cartoon series, or comic book did or could: "... [a] fool [who] seeks to return to the past to undo the future that is Aku!"