Which is better, FlutterFlow or Bubble?

As a cryptocurrency and finance professional, I often find myself needing to quickly develop prototypes for financial applications. I've heard about FlutterFlow and Bubble as potential tools for this, but I'm not sure which one to choose. FlutterFlow seems to offer a more robust set of features, with the ability to build both mobile and web apps, while Bubble boasts a more user-friendly interface and drag-and-drop functionality. So, which is better for quickly developing financial app prototypes: FlutterFlow or Bubble?