For me personally, I like Rose's solo specifically, but am neutral on BP and the other girls' solos.
I'm sure there are lots of groups who have had one or more members who go solo, but it's hard to tell you who when I didn't follow the solo stuff.

Purple Kiss does come to mind, I never really understood why RBW wasted a comeback on doing a Swan solo instead. Purki wasn't popular enough to support having such a long break and Swan didn't individually have a popular enough solo fandom to support a release either, especially one that made very different music from the main group.