Today's choice has come up a few times already, and there's not much I can add to what others have posted on the merits of
#4. Kull the Conqueror #1-10
so instead I'll focus on my personal connection to what I regard as the finest sword-and-sorcery series ever published.
I graduated from high school in the summer of '75. As part of my graduation goodies, my parents gave me the money ($250, if memory serves) to buy my friend Rob Luettgen's 2500+ comic collection, which enlarged my own by some 400%. There were super-hero comics galore but there were also substantial runs of Conan the Barbarian, Creatures on the Loose (featuring Gullivar Jones and Thongor), Savage Tales and Kull. I was almost completely ignorant of the s&s genre at the time--I don't remember why anymore--but I took to it immediately.
It was Kull that stood out from the crowd with its tight plotting, glorious artwork and marvelously complex lead character. I also liked the presence of a set location (the City of Wonders, capital of Valusia) and a recurring cast (Brule, Tu, Ridondo, Alecto), elements missing from the more picaresque adventures of Conan or Thongor (it's probably that same mindset that leads me to prefer Deep Space 9 over the other Star Treks). I'm particularly fond of #1 (with artwork by Ross Andru and Wally Wood), #6 (whose cover is my avatar), #8 (an excellent werewolf tale) and #9 (in which Kull quietly commits an act of great kindness to a cast member normally played for comic relief).
With all due apologies to Doug Moench and Mike Ploog, it broke my heart when Marvel took away Kull's throne, reducing him to just another nomadic barbarian. Even worse, the stunning art of the Severin siblings, which had given the fantasy world of the Pre-Cataclysmic Age depth and believability, was gone. But for those 10 issues (plus Monsters on the Prowl 16, which bridges the long gap between #2 and 3), sword-and-sorcery was as good as it gets.
All hail King Kull!