Sabai,
Your statement doesn't surprise me as I'm sure this whole thing is very system dependent. In my system I hear very little difference but if I had it all to do over again I'd probably go the rhodium route because of the increased durability. As I mentioned I have had gold wear off AC prongs exposing the underlying copper and who knows what goes on inside the outlets?.
When it comes to audio I try to abstain from making all encompassing statements such as "there is no difference" as my opinions are based only on my own experience. Too many variables exist to make such statements.
While asking for opinions is a good place to start, experimentation is definitely the key to finding what's best for a given system and listener.