Compatibility with various display standards common in European regions during the Wii era. Why Use WBFS Instead of ISO?
The "Europe" version (often referred to as the PAL version) was specifically localized for European and Australian markets. It features support for multiple languages, including English, French, Dutch, Spanish, and Italian. Mario Kart Wii Europe Wbfs
For language learners or multi-lingual households, this is a massive advantage over the US version, which generally offers only English and French (or Spanish in later prints). Mario Kart Wii Europe Wbfs