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When building a portable desktop computer for gaming, choosing a form factor that balances size with expansion capabilities is crucial. The Micro-ATX form factor is particularly suitable for this purpose because it provides a good mix of compactness and functionality.

Micro-ATX boards are typically smaller than standard ATX boards, making them easier to fit into smaller cases that are more portable. These boards usually have enough expansion slots and ports to accommodate a solid gaming experience, allowing for the installation of essential components like a dedicated graphics card, additional RAM, and storage devices, which are crucial for gaming performance.

In contrast, options like ATX and BTX, while they offer greater expansion capabilities, are larger and may not be as portable as desired for a gaming setup meant to be relocated frequently. Mini-ITX is another compact option, but it generally has fewer expansion slots, which can limit your ability to upgrade components in the future, potentially impacting gaming performance as new games and technologies emerge.

Thus, Micro-ATX strikes the best balance between size and functionality for a portable gaming desktop, making it the most suitable choice.