Worth Browns on the Brueko seem the "cleanest" for me, but I bought it used and don't know if that was how they originally felt. To me, they have a tension that makes it great for fingerpicking, but harder for barring. But that may be the higher action, too.
My new Kala ASOV S that was the Overstock deal a few weeks ago still has the stock Aquila New Nylgut. I felt like my hands were needing to be washed after playing for a bit. I attributed it to the powdery coating that seems to be on their new strings, as I noticed the same thing when I purchased my Luna that came with the same strings. Now that the strings have been on for a while it is not as noticeable, as was the case with the Luna. I was leaning towards changing the strings to Martins, but they sound so much better after a few weeks. It wasn't a staying-in-tune issue as much as a odd sound to the uke. Now it is good to my ears
I barre the best when using Martins.
Soprano - Koaloha Opio (Sapele), Martin OXK (HPL), Brueko No. 2 (Maple), Kala ASOV -S (Spruce/Ovangkol), Vintage 40's Silvertone (Mahogany), Vintage 50's Harmony (Birch), Vintage Camp Uke (Birch) Zither Heaven (1 Black Walnut & 1 Cherry), First Act Discovery (Plastic)
Concert - Luna (Spruce top)
Tenor - Outdoor Ukulele (Composite Polycarbonate), Mainland (Mahogany)