I'll assume by "Stance" in the case of Neutral Stance and/or Fighting Stance we mean "Pre-Fighting Posture", since the word "Stance", to me, kind of defines what is happening from the waist down, where as posture would define what is happening from the waist down, and from the waist up.

Anyway, I think the best Pre-Fighting posture would be the one that allows you to execute the offensive and defensive techniques for your fighting style most effectively. For example, a Wing Chun pre-fighting posture may involve holding the hands along the center-line, since this would be most ideal for executing the Wing Chun techniques of offense and defense. On the other hand, Choy Lee Fut fighters might not see the Wing Chun posture as most effective for executing their circular strikes.

Wrestlers have their own pre-fighting posture which, I'm guessing, looks nothing like what Wing Chun or Choy Lee Fut fighters use.