The rule I use is Koa Ukuleles sound best with Aquila or D'addario Strings. Mahogany Ukes sound better with Worth. The exception to this is Koaloha. Spruce goes either way.
Laminates generally like Aquila Strings (except for Kiwaya) as well. I think Worths are so much better than Aquilas on Flukes and Fleas.
Kiwaya laminates tend to like the fluorocarbon types, including Worth. The same rule applies for their solid ukes. 🙂
@hermanvdc had this to say on the subject of Ukulele Strings:
Indeed, Aquila helps give more brilliance to cheap ukuleles but on good the better ones Worth and especially Orcas sounds better!
So, I figured that I should post this so that everyone can make up their own mind and then give you some links to buy Orcas and Worth Ukulele Strings.