If the strings Mim put on your soprano are white, then most likely they are Nylon of some sort. If they're clear, it's hard to tell without hearing them.
Nylons give you more of the traditional Hawaiian sound. Bright and snappy.
Fluorocarbons and some of the carbon mixes will give you a warmer sound with more of a ring to it.
You can try a set of Oasis Bright strings and then a set of Worth Brown Mediums that are warm but still have good sustain.
That would give you a wide range of sound to experience on your uke. Use them as a baseline for strings. If you want to get really systematic about trying strings, keep a log of the strings you try and what you like and dislike about them. Including the ones that are on it now.
Make sure you give each set at least 2 weeks to stretch out and settle down before you make your final judgement. The sound can change quite a bit as they settle.
Strings are funny sometimes. My favorite strings are Living Waters Fluorocarbons. I have them on several of my tenors. (Which is the only size I play.) But i have a couple of tenors that I did not like the sound of them with LWs at all. Some just don't rock your boat. Some sound better strummed while others sound better picked. I didn't like Fremont BlackLine strings when I first put them on my Martin tenor. But after playing them for a couple of weeks, they sounded quite good.
Take your time and enjoy your explorations.