GX is pretty cool but F-Zero X will forever be my favorite.
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How does it compare? Similar difficulty?
F-Zero GX is much harder in the story mode stuff. F-Zero X varies depending on difficulty setting and cup selected.
I played it to death when it came out and never managed to beat it, so much content and such a lot of it was incredibly difficult. Absolute blast to play though, at some point I do want to set up Dolphin and emulate it in high def.
I can confirm that it's incredible on Dolphin! Playing in widescreen is a treat.