The answer to that is debatable as every unit has it's strengths and weaknesses and every unit can be countered with another, this makes the game balanced.
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You can play Starcraft Broodwar online on Battle.net.
/f a name of your friend
Probe, Zealot, Dragoon, High Templar, Dark Templar, Archon, Dark Archon, Reaver, Observer, Shuttle, Scout, Corsair, Carrier, Arbiter.
Starcraft was co-developed by Saffire and Blizzard Entertainment.
Zerg is an alien race in Starcraft.