What kind of baritone. I found with my vintage ones, Martin and Favilla, they sound best with a nylon and wound 3&4. For my newer ones, like the Webber, they seem to like a fluro with wound 3&4.
Like so many others here, I've got a box of different string sets looking for the right one for the right uke. I just put a set of Martin 630's on the vintage Martin and it sounds really good. The Favilla has a set of the T1's and sounds okay. On the Webber, I put on a set of Southcoast HL-SW's. It's a higher tension string. So far I like Southcoast the best for wound 3&4. If you want a high tensioned set, the Southcoast is the way to go IMO.
I tried the Guadalupe but didn't like the texture of them; especially when sliding up the neck.