PS2, Link is just a silly extra character edition. However its the main reason gamecube owners bought the game. I have the Xbox edition cause I have the Xbox hooked up component. The ps2 edition I play at Drinky's house and its awesome. Heihachi is a mean mofo.
You don't have to own a "Gamecube Stick" to play SC2 Cube with an arcade stick.
There's an easy way involving buying a little something at a store, which I am 100% against.
And a fun way involving doing your own electronics work which I loooove to do.
Point is, platform specific hardware never has to enter the picture. This is true for all venues.
But I'm sure you knew that.