It also depends on how open the map is, how fast the units spawn, etc. For example, if there are narrow paths on a small map, units like ghosts would need to be enhanced, compared to as if it was completely open, big, with lots of units, where ghosts would excel much more.
With everyone having 10 hp and 5 attack, Infested Duran would own everyone else, followed by raynor, hunter killer, firebat, zling, dragoon, zealot, infested kerry. Those are just guesses, of course. What you need to do is find out which units are the worst through testing and enhance those that are the weakest and cripple those that are the strongest. Balancing is fun
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that pretty much sums up balancing issues. because of all their unknown variables(terrain, map size etc.) i like to use d/s as a base for the unit stats and tweak them as necessary. balancing is really just grunt work, not particularly fun, but absolutely necessary.