Does it matter to you how long your game master has been running their current system of choice, or is overall refereeing experience really what counts, and pretty much transfer over between games? Is someone who has experience with a lot of different styles better or worse than someone who's pretty much one run one system, or a handful of closely related systems, for their entire gaming career?
And it occurs to me that some of the difference, if there is any, could have as much to do with age as with actual experience. Are there any relatively new game masters out there who aren't in their teens? How do they stack up?
How much experience has your current game master had? How much had the best game master (assuming you keep score that way) had?
How much have you? How much better of a game master do you think you are now than when you first started? Are there any areas where your first game(s) were better than the ones you're running now?