Which bottle has a nipple closest to the shape of an actual nipple?

Their are several bottle brands which claim to be best for fed babies, but which one is actually shaped like a real ? I personally am leaning towards Soothie because I've heard only good things, plus they have matching pacifiers which hospitals routinely send newborns home with. Other brands include flow and Closer to Nature. I've also heard that Nuk pacifiers are nipple-shaped, but in my opinion this is not true.