i havent played starcraft in such a long time. I usually play it with Terran. But if I had a choice between those two, I would pick Zerg, cause I love the sounds it makes when my aliens pop out of their eggs
Protoss are definitely the best if the game is assumed to go on for more than 5 minutes. Zerg are very OK for the first "quick rush", but don't have any real power to capture-and-hold many bases simultaneously. JMHO.
zergs, u can tire out ur opponent with a almost infinite swarm of units, with guardians/hydras/zerglings, works esp if the opponent has a slow cpu, cause all that fightin will slow down their comp and wont be able to attack quickly