I think your premise is a little off. One is not better than another, it's what's suited to the rider's ride posture, style and intended use. It's all a compromise, the question is which compromises suit you? If you don't rotate your pelvis, you will likely prefer a shorter top tube and not much drop. If you are an aero pro rider, you probably riding an elongated top tube and deep drop And on and on. Once you get past basic comfort and handling, "proper" fit is about how you intend to ride and your expectations.

One of my favorite bikes has a 56cm tt and 60cm st. Old skool geometry and a blast to ride, but very 'wrong' for many reasons depending on the criteria. What's yours?