If you plan on installing massive mods like Smash Universe (which adds 200+ characters) or Project M , you use a full, unscrubbed ISO.
This is the ultimate method for creating a "highly compressed best" version, allowing you to custom-build a copy of Brawl as small as possible. By stripping out or compressing the game's largest assets, you can get the game size down to an impressive . super smash bros brawl highly compressed best