We've used both at Heap. I wouldn't expect much of a performance change from switching in either direction. JSONB has the advantage of being in a data format th

We've used both at Heap. I wouldn't expect much of a performance change from switching in either direction. JSONB has the advantage of being in a data format that lots of tools speak, and has generally been less annoying to use. But if your app is pretty stable and all of your code already speaks hstore, probably not worth it.