I usually recommend the ultimate over the signature purely because it has a lower band which a) gives more back support (back pain is likely to be a problem especially if you find sleeping on your back and upright uncomfortable) b) because the band is lower it doesnt rub on your incisions and the tightness around it doesn’t cause you extra pain and irritation and c) its rated with a higher support on the website, the new boobies need that support d) has a lower neck line allowing you more choices of tops and dresses to wear (dont see much difference tbh lol but still pretty low neckline) x
i do also really love the signature though so go with your instinct, and if it comes down to cost and you dont wanna spend the little extra fair enough the signature is still amazing enough 🙂 x