Personally I would prefer matchups based on percentages of the win ratios. Your own win ratio is done in percentages why not the matchups. For instance we could say this is 55% in Haku-men's favor. Thus suggesting that 55% of the time Haku-men is at an advantage during this matchup. No rounds, no matches, no anything, just the simple matchup ratio.
You can only get so far with numbers anyway because fighting games are usually so complex that there could be any number of situations that might arise to tip the scales one way or the other.