1. Composite, RF, S-Video, and Component. There is no official HDMI adapter for the Wii - only third party ones.
2. The Wii2HDMI isn't superior nor inferior in terms of video quality to a set of good Wii component cables. However, it's a lot cleaner to set up since HMDI is a single cord as Component splits into five. Keep in mind though, that the Wii2HDMI only works for the original models of the Wii. The Wii Mini does not support Component and can't be used. I own the Wii2HDMI myself and recommend using it simply because it saves on having so many connections at the back of the tv, switchbox or whatever else your setup uses.
If you already own the very rare Gamecube component cables, then no, there is no advantage in terms of video quality. Keep in mind the Wii2HDMI is not an upscaler - it simply converts Component signals to HDMI signals. GameCube games that don't support progressive scan will still be in 480i even via a Wii with the Wii2HDMI. GameCube games that do support progressive scan will be in 480p. However, if you don't own the GameCube component cables or simply wish for a cleaner set up, then yeah, the Wii2HDMI will be a lot cleaner.






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