I'm going to go against the grain here and say that I think SC is much, much better than AoW (I haven't read any of ST yet). There's way too much fighting of the same enemies over and over again in AoW, and they're extremely annoying enemies to boot (if I were a player in an AoW campaign, I'd get really sick of enemies dropping brain-eating worms on me in every other fight pretty damn quickly). And except for the brilliant roleplaying adventure "Prince of Redhand," there's nothing really standout about it IMO.
With SC, I think the city of Cauldron helps keep the campaign more grounded. Having a place the PCs call home is a powerful foundation for a campaign, and it's something AoW lacks.