You're better off getting the PS2 version over the 360 HD version.
Kojima's games use pressure sensitive button inputs--holding the face buttons down soft or hard have different effects. This mechanic is not supported by the 360 controller. They built work-arounds, but it's not as intuitive as the original controls.
PS2 Sustenance has the most content (Snake vs. Monkey, secret theater), but PS3 is probably the most definitive experience.