/vr/ - Retro Games

If you had to pick one, and only one, what would it be and why? They have a lot of crossover, but there's few multiplats on the Gamecube that weren't also on the Xbox. Xbox however has a number that were not present on the Cube at all. Feature wise, apart from the online they cover a lot of the same bases. It largely comes down to the library.

Which do you go with?