Namek Saga
Goku and his allies travel to the planet Namek in search of the Dragon Balls while facing off against powerful enemies. The Namek Saga is the best, beginning with the Saiyan conflict between Raditz, Nappa, and Vegeta. Then it shifts to the three-way guerrilla war on Namek, where Zarbon, Dodoria, and Cui battle Vegeta, who later joins forces with the protagonists to take down the mercenary Ginyu Force.
The saga culminates in the rise of Super Saiyan Goku, who faces Lord Frieza to stop the tyrant's threat. This was Akira Toriyama's masterpiece.
Frieza Saga
The Z Fighters battle the tyrant Frieza, culminating in Goku's transformation into a Super Saiyan during their epic confrontation. My favorite character, Frieza, makes his debut in this saga. The epic battle between Goku and Frieza lasted around 20 episodes (WOW), and the ending was brilliant. Overall, this is my favorite saga.
The battle between Frieza and Goku was the greatest fight I've ever seen, and this was the saga where Frieza was the main villain.
The saga starts with arriving on Namek and ends with leaving. The Frieza Saga is my favorite.
Cell Saga
The android Cell seeks to achieve perfection by absorbing Androids 17 and 18, leading to a final battle against Gohan. Gohan almost became the main character and was the only character other than Goku to defeat the main villain of a saga.
In my opinion, the Cell Saga was the most emotional of all of them, and the fights and power-ups were epic.
Way more dramatic than Frieza's.
Kid Buu Saga
Goku and Vegeta face the final and most dangerous form of Majin Buu, Kid Buu, in a desperate struggle to save the universe.
Saiyan Saga
Goku and his friends defend Earth against the Saiyan warriors Vegeta and Nappa, with devastating consequences. Super Saiyan. Top ten, nice.
Trunks Saga
A mysterious warrior named Trunks arrives from the future to warn the Z Fighters about the upcoming Android threat. The best saga with a true storyline! There's deep meaning in the saga, with new characters and a really original plot. I mean, who expected Vegeta and Bulma to have a son when you first saw it?
Majin Buu Saga
The ancient menace Majin Buu is resurrected, threatening to destroy Earth and forcing Goku, Vegeta, and their allies to fight for survival. Best of all. Funny as well as adventurous. Every moment of the saga keeps you curious to the extreme. Majin Buu, the villain, is physically and mentally different from what he appears to be. He's both cute and dangerous at the same time.
Despite this, Goku, the main character, is dead throughout much of the story.
Omega Shenron Saga
Goku and Vegeta battle Omega Shenron, the final and most powerful of the Shadow Dragons born from the misuse of the Dragon Balls.
Universe Survival Saga
Goku and his team compete in a multiverse tournament where the fate of their universe depends on their victory.
Red Ribbon Army Saga
Goku sets out to dismantle the Red Ribbon Army, a paramilitary organization searching for the Dragon Balls.
The Newcomers
? Goku Black Saga
Goku and Vegeta travel to the future to stop Goku Black, an evil version of Goku who seeks to destroy all mortals.
? Super 17 Saga
Goku and his allies face the fusion of Android 17 and Hell Fighter 17, known as Super 17, who threatens Earth.
The Contenders
Android Saga
Goku and the Z Fighters confront powerful androids created by Dr. Gero, leading to the emergence of an even greater threat, Cell.
Baby Saga
The Tuffle parasite Baby seeks revenge on the Saiyans by taking control of Vegeta's body and threatening Earth.
World Tournament Saga
Goku competes in the 25th World Martial Arts Tournament, which is interrupted by the arrival of new enemies.
General Blue Saga
Goku continues his quest for the Dragon Balls while facing the deadly General Blue, a top officer of the Red Ribbon Army.
Commander Red Saga
Goku infiltrates the Red Ribbon Army's headquarters to face Commander Red and prevent the misuse of the Dragon Balls.
Garlic Jr. Saga
Garlic Jr. escapes from the Dead Zone and seeks revenge on the Z Fighters by enslaving Earth with the Black Water Mist. I know it's weird, but this is my favorite saga. Why? There's Maron.
King Piccolo Saga
Goku battles the evil King Piccolo, who aims to take over the world after being freed from his imprisonment.
Tien Shinhan Saga
Goku enters the 22nd World Martial Arts Tournament, where he faces the powerful and conflicted fighter Tien Shinhan.
Tournament Saga
Goku and his friends enter the 21st World Martial Arts Tournament, competing against the world's strongest fighters.
Fortuneteller Baba Saga
Goku seeks Fortuneteller Baba's help to locate the last Dragon Ball, facing several challenges in her tournament.
Second World Tournament Saga
Goku competes in the 22nd World Martial Arts Tournament, facing Tien Shinhan in a climactic showdown.
Emperor Pilaf Saga
Goku embarks on his first adventure to collect the Dragon Balls, clashing with Emperor Pilaf, who seeks to use them for world domination.
Zamasu Saga
Goku and his allies confront the rogue Kai Zamasu and his counterpart Goku Black, who threaten all of existence. Loved this saga! Probably the best!
Piccolo Jr. Saga
Goku fights Piccolo Jr., the reincarnation of King Piccolo, in the 23rd World Martial Arts Tournament.