starcraft unit vs. unit

I was just bored since blizzard has not posted anything lately. I just wanted to compare units and see which one is the best.

Zealot vs 2 Zerglings These are the primary attack units of protoss and zerg. A zealot costs 100 and 2 zerglings will would cost 50. Well if we talk about minerals 4 zerglings will beat one zealot. So i guess the zergling wins.

Marine vs Zergling Both could win exept marine could win with micro but Zergling would win in a comp match.

Marine vs.  Zealot well micro depends. But if it was comp, it would lose even two marines would lose.