To me, placing one single best series in Jump has always been hard (both because due to my English-only language skills some series aren't available, and some are too close for me to call).
Dragon Ball is definitely top 10 material, I can't deny it any less, but man, I'd say it has some fierce competition.
Fist of the North Star was King of Shonen Jump during Dragon Ball's debut, and Dragon Ball only surpassed it in its last year or so. Goku may have known martial arts, but Kenshiro was a master of his, and he knew just when to shed manly tears, and when to kill a foe...and sometimes one right after the other. It had a good mix of badass action, insane violence, and heart-wrenching emotion. It had quite a good run, but even the best of shonens run out of steam eventually (well...most do). It did continue years later under Fist of the Blue Sky, but it left Shueisha by then.
Saint Seiya was the second series to surpass Fist of the North Star's popularity in that last year, and it was a fierce competitor with Dragon Ball during the next several years (the anime's death due to a ratings killing filler bomb is likely responsible for the manga's drop in popularity). Goku seemed like a kitten compared to Seiya's hotblooded nature, and for all the touts of Dragon Ball as an "unbeatable" series in terms of power, Seiya and co surpassed Goku long before the series ended, as teenagers (the series ended before Goku even went SSJ, and they did turning golden and getting a god form first). It's certainly one of the most battle shonen-y battle shonens ever, and I love it for that. It may have ended, but Kurumada never gave up on Saint Seiya. He brought it back as Saint Seiya: Next Dimension in full color in 2006, and it still continues (not counting the various anime and other manga spinoffs).
Jojo's Bizarre Adventure never really made the top of Shonen Jump's popularity, but it was always consistently popular, and outside of Kochikame, you won't find a longer running Shonen Jump manga as it has passed 110 volumes, and shows no sign of ending any time soon. Starting off as a story that almost seemed slice of life before turning into a fantastical battle between ancient martial arts and vampires, Jojo's Bizarre Adventure is easily one of the best things to ever run in Jump. One of the appealing aspects of the series is that it doesn't just stick to one cast forever, but every Part of the story continues with a new cast, new enemies, and even a new story type, all linked to the Joestar Bloodline (and all called Jojo due to their names). Amazing writing, great characters, more copyrighted music names than you can shake a leg at, and powers that over the years are creatively amazing make this series great.
Phantom Blood (Part 1) is the story of the gentleman Jonathan Joestar in the 1800s battling his childhood rival Dio Brando who had become something else due to the Stone Mask. Battle Tendency (Part 2) is the story of Jonathan's grandson Joseph Joestar in the 1930s traveling the globe to deal with the creators of the Stone Mask. Stardust Crusaders (Part 3) is the story of Joseph's grandson Jotaro Kujo in the 1980s, who has to traverse the world in 50 days to end a curse from an old enemy. Diamond is Unbreakable (Part 4) is the story of *spoilers*, Josuke Higashikata, as a series of mysteries have to be solved in his home town of Morioh in 1999. Vento Aureo (Part 5-Golden Wind) is the story of *spoilers*, Giorno Giovanna, whose dreams of becoming a "Gang-star" lead him into a dangerous series of events in Italy circa 2001. Stone Ocean (Part 6) is the story of Jolyne Cujoh, Jotaro Kujo's daughter, who has to survive in Green Dolphin Street Prison after being put in for a crime she didn't commit in 2012. Steel Ball Run (Part 7) is the story of Johnny Joestar in the 1890s, who is involved in a horse race across the United States for a great prize. Jojolion (Part
is the story of a man with amnesia who assumes the name Josuke Higashikata in 2011 after the Earthquake in Japan, who seeks his identity in the town of Morioh with some suspicious characters.
For more modern series:
Toriko is easily the best currently running shonen in Weekly Shonen Jump for me. You can tell there's inspiration from Dragon Ball, but its also got its own flare, like something new stepped out from the 80s Jump in the modern era. The world is an interesting one, full of monsters of various degrees of power, and unique environments, yet a world that respects food above all, even wealth. The fights are amazing and I love the characters. You can feel Toriko's passion for food and strong foes in every fight. This manga is literally what Heaven would be for Goku, and in my weekly reads, it almost never fails to be #1. After reading only one chapter at the start of my Weekly Shonen Jump subscription, I had to get volume one. By my birthday a few months later, I got every volume available from Viz, and after that, I read all I could fanwise to close the gap (though I still buy English volumes from Viz). It's a gem, pure and simple (DBZ may have beams down, but this series has raw strength that puts any feat from DBZ to shame).
One-Punch Man may be one of the best drawn series to come from Shueisha. At times, it's basically got all the key animation done for an anime, which leads to some amazing gifs (see below). The plot is amusing, as Saitama wants to be a hero for fun, but (at least at first), he beats all his foes in One-Punch, disheartening the bald youth (who claims he lost his hair in growing stronger). It's hard to say more without spoilers, but it's an interesting read. While in the US SJ, it's not in the Japanese magazine, being instead a digital release...but I like to count it because I read it in Jump. It's a lot of fun too.
https://38.media.tumblr.com/f69c4a8d558 ... o1_500.gif
https://38.media.tumblr.com/b1875b38b93 ... o1_500.gif
https://33.media.tumblr.com/4793fe7dd44 ... o1_500.gif
But yeah, even with these and many more good competitors, Dragon Ball still stands out. It started out as a more comedic adventure shonen with some action, and it changed with the fans, and you grow with Goku, in a way that's less common with most shonens. It's not the best written or drawn series, but Toriyama has a special charm that just makes it work. There's a reason it's one of the most successful shonen series worldwide. He may make up a lot of stuff on the fly, but he always finds a way to make it work.
So a lot of the list is good by me.
Though I hate Naruto with a passion of a thousand Suns, so I could stand it not being there.
She/Her 
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