While they should be seen as a continuation of Goku's story, it is not necessary to watch either Dragon Ball Super or Dragon Ball GT. There are some great moments in these shows but they aren't required viewing for Dragon Ball fans.
The show was created by Toei because Toriyama was done writing Dragon Ball at the time, but they wanted it to continue, because it was their biggest moneymaker, so they created GT instead of waiting for Toriyama to write more, which is basically what filler is.
It's got the reputation it has for a reason and there's no reason you should feel that you HAVE to watch the entire thing, but these days there's no harm in watching a few episodes, seeing what it's about and being able to quit knowing there is no long term ramification on the main series!
Well, yeah you can, if you want to watch it sooner or later I suggest to skip the first arc altogether and just get info on Baby, maybe even the Super 17 arc too, that arc literally makes no sense, though gotta say that GT has hands downs the best ending out of all the series.
No you do not need to watch Dragon Ball GT before starting Dragon Ball Super. It's just that due to the immense success of Dragon Ball Z, TOEI Animation decided to continue with the series. Akira Toriyama sama, the original creator of the series had ended the manga just where Dragon Ball Z ended with Buu.
Dragon Ball GT follows the events of the previous anime, but with an all-new story that was not fully created by Akira Toriyama. Despite the author being present in the project, many claims that the anime is not part of the canon exactly because it does not adapt a story created by the mangaka.
Goku is on his way to mastering Ultra Instinct in Dragon Ball Super, but back in Dragon Ball GT, he already unlocked the form through Super Saiyan 4.
According to the timeline, Dragon Ball GT takes place between the years 789 and 889 of the Dragon Ball calendar (for reference, the battle with Frieza on Namek takes place in 762). This is, however, not the first time that GT has been considered part of the franchise's canon.
In theory, Super is placed before GT and after Z, that's why we leave this series for the end. The production company released a series of 64 chapters that followed the story after the tournament where Goku meets Uub.
Not only does this show that GT Goku is stronger (He fought people STRONGER than Super Buu in base form.) Not to mention that if it's true that Goku absorbed ALL of Super Saiyan god's power into his base form, then this ALSO shows that Super Saiyan god's power is only 8X higher than Super Saiyan 3.
Those events that take place in Age 794 (known as 2029 on the Gengoro calendar) only in the Funimation dub, in which Dragon Ball GT takes place ten years after Dragon Ball Z.
Though he briefly regains his adult body when gaining the Super Saiyan 4 transformation, Goku stays a young kid for pretty much all of Dragon Ball GT.
Contrary to popular belief, there IS a manga of Dragon Ball GT. However, it came AFTER the anime and was not created by Akira Toriyama, therefore making it unofficial to the official Toriyama-verse.
(孫悟空ジュニア) is a descendant of Pan and Goku who appears in the movie Dragon Ball GT: A Hero's Legacy, as well as the very last episode of Dragon Ball GT.
Dragon Ball GT opens five years later, shifting Goku to physically 42 but chronologically 49 years old. Emperor Pilaf steps in to complicate things even further after reverting him back to an 11-year-old while retaining his adult mentality.
Aside from designing a few characters, Akira Toriyama was largely uninvolved in Dragon Ball GT's development, and it shows. It takes place 15 years after the end of the Majin Buu Saga, and 5 years after the end of Dragon Ball Z.
However, both are considered canon within the anime. While they should be seen as a continuation of Goku's story, it is not necessary to watch either Dragon Ball Super or Dragon Ball GT. There are some great moments in these shows but they aren't required viewing for Dragon Ball fans.
Six-Tails Unleashed is the better Tailed-Beast arc for a few reasons, going the extra mile in storytelling. The arc weaves a bittersweet tale between a master and his student, a perfect fit considering it takes place just after Jiraiya's death.
Topping the list is Detective Conan, also known as Case Closed, a long-running detective series. With a staggering 440 filler episodes out of a total of 1039 episodes, it holds the record for the most fillers in an anime.
The in-story reason for this is provided in the Dragon Ball Super manga series. Speaking with Vegeta, Goku reveals that ever since the Tournament of Power ended, he's been unable to repeat his Ultra Instinct transformation, implying that the power can only be used in the direst of situations.
GT is better in the sense that its targeted at a younger viewer age group. GT has younger fans but older dragon ball fans might find that the only real interesting aspect of GT was some of it aesthetic character designs, egs. SSJ4, Golden Great Ape, Xin-Shenlong, Nova and Ice Shenlong.
After Toriyama returned to help craft his own sequel series in Dragon Ball Super, it effectively erased GT from canon. That doesn't mean fans should forget it, though. GT did many things worth admiring in terms of character, craft, and creativity.