Buy a set of Aquilas, Nylgut, Worth Browns and Worth Clears. Whenever the current set of strings starts sounding dead to you, (couple of months), change over to one of the others and try them out.
HAve to agree with thosw above. I bought a cheap Mahalo soprano to put in my suitcase when I went abroad and it came fitted with GHS strings. They were OK on a cheapy instrument, but swapping them out for Aquilas made a difference that was quite striking.
I don't know about other strings on an Oscar laminate, but Aquilas made my OU5 sound a much better uke and many others have found they did the same for their Oscars. I was ready to put mine away until I tried them.