One of the more interesting, if less discussed, similarities between Dragon Ball and Naruto is that throughout the manga, the titular stars of each series, Goku and Naruto, become fathers. In between battling Freiza, the Otsutsuki clan, and others bent on dominating the Earth, both Goku and Naruto found time to start a family... but just because they started a family doesn't mean they were great at maintaining them. But what do their demanding duties mean in regards to their relationships with their children? It should be noted that, ultimately, both Goku and Naruto love their children tremendously. This is clear from the numerous times both have been willing to sacrifice their own lives for their children. However, despite their love, their upbringings, life experiences, interests, and non-familial responsibilities negatively affect their desires and abilities to win a "best father" award.
On the one hand, Goku’s singular focus on improving himself, and defeating those who would threaten the Earth means that he often skips family dinner time and parent-teacher meetings. Similarly, it is well known that being the Seventh Hokage, Naruto’s near-constant preoccupation dealing with the challenges of governing Konohagakure as a village, managing the relation with other villages, and personally confronting threats to the village’s peace and security meant he was often absent from those key moments in his children’s life.
A common point of agreement among fans is that Goku and Naruto are not exactly the model of family men, and there is plenty of evidence to prove this argument. One of the more egregious examples for Goku was that he consistently tamped down Gohan's interests to be who he wants to be and pushed him into being who Goku thought he should be. More devastating, though, is the fact that Goku was not present for the birth of either of his children. Though he's off the hooks for Goten's birth due to being dead at the time, readers still have no clue why Goku missed Gohan's birth.
For Naruto, while he was willing to let Boruto explore his interests, he does have an incredible knack for avoiding real quality time with his son under the pretext of "I'm busy," especially when Boruto is needy. Though he might try to excuse this by saying his duties as Hokage are important, Naruto could easily assign tasks to free up his time. Moreover, there are plenty of capable hands to fill in so Naruto could be an actual parent and spend time with his children.
So, who is the worst parent? The fact that Goku missed the birth of his children is pretty damning. But that is more expressive of being a bad husband, which is a whole other story. Conversely, the fact that Naruto can actually afford to carve out a bit of quality time for his kids, but never does so expresses an intent to avoid, rather than a result of circumstances. Accordingly, it's Naruto rather than Dragon Ball's Goku who must work harder on improving his parenting skills