On lighter electric sets, the 3rd string is almost always plain steel. Once gauges get heavier, a plain G becomes stiff and hard to bend, so many heavier sets switch to a wound 3rd. Jazz players often prefer a wound G for its rounder tone, even though it makes big bends harder.
You can try both without buying two sets. Our S1150 Medium Light (.011–.050) ships with both a wound .020 and a plain .018 3rd string, so you can set the guitar up either way.
Single strings are another option. Our electric singles overlap between .018 and .026, so you can buy that range in plain steel or wound and build the 3rd string you want.
If you switch between plain and wound, check the intonation afterward. A different 3rd string can also sit differently in the nut slot, so a small setup adjustment may help.