The PS2 had the grid-based "Dragon History." The Wii replaced this with an over-the-shoulder, third-person exploration mode. You walk around a 3D map of Earth, gathering Dragon Balls, fighting random encounters, and unlocking items. It adds a genuine adventure layer that the PS2 version completely lacks.
Dragon Ball Z: Budokai Tenkaichi 3 for the Nintendo Wii is frequently hailed as the definitive Dragon Ball simulator, offering a nearly exhaustive roster of 161 characters and a refined combat system that captures the high-speed intensity of the anime. While the PS2 version is a classic, the Wii version is often considered superior by fans for its enhanced graphical clarity and unique motion-controlled gameplay. Dragon Ball Z Budokai Tenkaichi 3 Review dragon ball z budokai tenkaichi 3 wii iso highly better
If you want to play a roster of 300+ characters including manga-exclusive Moro and Granolah, you need the Wii ISO. The PS2 had the grid-based "Dragon History