Everyone has their favorite...what's yours and why?
For me, it's Fires of Heaven because it was the beginning of Rand's rise to Power, before he got so full of himself and the story got so incredibly botched with more characters than a Bayou dog's gots fleas. Back then it was simple. Maybe three of the Forsaken were involved, the Good Guys and Bad Guys still wore opposite colors and the story was still....well, fresh.
Everything since then....filler.