Re:Why always equal medals?
There's no reason other than to make the victory conditions simpler. An easy to solve this is to give the weaker side an extra point at the start or 2 points for eliminating certain tough units.
Of course, you can always design your own scenarios (or play the existing ones) with differing victory conditions. I played Scenario #9 to 5 medals rather than 4 because it seemed to end too quickly.