For sheer intensity and spectacle:
* Goku vs. Frieza (Namek Saga): This is arguably the most iconic battle in Dragon Ball Z, featuring incredible power levels, memorable transformations, and the ultimate test of Goku's will. The emotional stakes and dramatic conclusion make it a fan favorite.
* Goku vs. Cell (Cell Saga): This battle features multiple stages, culminating in a desperate fight for survival against a powerful android. The stakes are high, and Goku's sacrifice at the end is a powerful moment.
* Goku vs. Kid Buu (Buu Saga): This battle showcases the true potential of Goku's power and the destructive force of the universe's strongest villain. It's a thrilling and emotional fight that culminates in a desperate final attack.
For strategic complexity and character development:
* Vegeta vs. Frieza (Namek Saga): This fight is a fascinating showcase of Vegeta's pride and his desire to prove himself as the strongest. It's a battle of tactics and strategy that explores Vegeta's complex character arc.
* Gohan vs. Cell (Cell Saga): This fight is a testament to Gohan's hidden power and his potential to surpass Goku. It's also a poignant exploration of Gohan's inner struggle and his ultimate responsibility.
* Goku vs. Vegeta (Saiyan Saga): This is the battle that first introduced the concept of Super Saiyan and showcased the rivalry between Goku and Vegeta. It's a classic fight with high stakes and memorable moments.
For emotional impact and personal connection:
* Goku vs. Raditz (Saiyan Saga): This fight is significant for its emotional impact, as it introduces Goku's brother and reveals his Saiyan heritage. The tragic ending adds to the emotional weight of the battle.
* Gohan vs. Frieza (Namek Saga): This is a powerful and heartbreaking fight that showcases Gohan's immense potential and his willingness to sacrifice himself to protect his friends.
* Trunks vs. Frieza (Future Trunks Saga): This fight is memorable for its dramatic impact, as it shows the power of Trunks and his determination to protect his future timeline.
Ultimately, the "best" Dragon Ball Z battle is the one that resonates most with you. Each battle has its own unique strengths and appeal, and different fans will find different ones to be the most memorable.