A basic comparison for the three basic units of starcraft. Terran Marines, Protoss Zealots and Zerg Zerglings.
Terran Marine
Cost: 50 minerals
Supplies: 1
HP: 40
Weapon
Damage: 6
Range: 4 (Not sure on this one, can someone with datedit confirm this)
Protoss Zealot
Cost: 100 minerals
Supplies: 2
HP: 100
Shields: 60 (Shields restore themselves at a rate of .9 points per second)
Armor: 1 (Armor reduces damage taken to its HP by 9.9% for every armor value)
Weapon
Damage: 8x2
Range: Melee
Zerg Zergling
Cost: 50 minerals (for 2)
Supplies: 1
HP: 35 (Zerg units restore their HP at a rate of .5 points per second)
Weapon
Damage: 5
Range: Melee
In a straight forward battles with no micro control of units the following results were taken:
12 Zerglings vs. 3 Zealots: Zerglings won 10/10.
12 Zerglings vs. 6 Marines: Zerglings won 10/10.
6 Marines vs. 3 Zealots: Zealots won 9/10.
In a battle with micro control of units/hit and run tactics the following results were taken::
12 Zerglings vs. 3 Zealots: Zerglings won 9/10.
12 Zerglings vs. 6 Marines: Marines won 9/10.
6 Marines vs. 3 Zealots: Marines won 9/10.
In a battle with bottle necks the following results were taken:
12 Zerglings vs. 3 Zealots: Zealots won 9/10.
12 Zerglings vs. 6 Marines: Marines won 6/10.
6 Marines vs. 3 Zealots: Marines won 7/10.
In conclusion each unit is better at different types of battle patterns. Zealots are best at close quarters 1v1. Marines are best at hit and run tactics and range. Zerglings are best at swarming and surrounding enemies.
Micro control typically required to win:
Marines High amount.
Zealots Medium amount.
Zerglings Low amount.
None.