I've tried a number of brands on my 1960's Martin O: Aquilas, Worth CM, Worth CD, and Martin Fluorocarbon strings. Generally speaking, while the Aquilas are the loudest, I don't think I can achieve a vintage sound with them (they sound great on my Kala cedartop). The Worths sound better, although I cannot ascertain much difference between the two tensions. A local dealer has a Martin O of the same vintage as mine. He has Martin fluorocarbon strings on it. I played this instrument and thought that it had a lot of presence and crunch. I believed my Martin was a bit lacking in these areas. I was reluctant to try the Martin strings, as I had read some negative reviews of them. But, when I did eventually try a set, my uke had the same tone qualities as I had heard from the dealer's uke. They are not as loud as the Worths when picked, but they are very clear sounding, and they are very punchy when strummed. I really like this dynamic contrast. Also, it seems that the longer I have them on, the better they sound - as if the instrument begins to resonate with the type of strings.
They are thin strings, even thinner than the Worths, so they take some time to get used to - the initial tendency is to throttle the neck since you can barely feel then under your fingers. You can produce a great variety of tone with them, not only by shifting from picking to strumming, but by changing where on the body or neck you are picking or strumming. They seem the most responsive, in this way, to me.
I'm not sure why they have gotten a bad rap, elsewhere I mean (not on this thread); perhaps it is the older nylon strings that people didn't like.