Who do you like better? The damage-inflicting Spectres, or the EMP-ing Ghost? I prefer the Ghosts. EMP can work wonders against things like Ravens or Valkeries. NO CLOAK FOR YOU.
Hmmm, I think the post is a little random tbh First off Valkyries are a BW unit, I guess you meant Banshees But Getting ghosts to do what the cc can do(reveal cloaked units) is a little waste of a tech... Also you don't have a choice in multiplayer as for which to get and you also don't have Terran or Protoss enemies in the campaign(unless for a couple missions where you go against P and too early ones against T). Also Spectres do bonus dmg vs armored, ghosts vs light. Spoiler I think ther'es a strat where you use mass spectres to kill kerrigan on the last mission but I don't know what it includes As a unit? I prefer ghosts - the campaign version where they get occular implants too. Which I find cooler? Spectres, cause they're ghosts but with top-secret kinky psi powers added...