No. Stick to the disc or a USB Loader backup. The "exclusive" features are largely placebo or bug fixes repackaged as rare editions.
The term "Mario Party 9 Wii WAD" typically refers to community-made digital packages used for playing the game on modded consoles. These are not official releases but rather custom files created by the homebrew community. The "Banner Brick" Issue mario party 9 wii wad exclusive
: It allows players to launch the game directly from the Wii System Menu without needing to open a secondary homebrew app like USB Loader GX HD Texture Support mario party 9 wii wad exclusive