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I believe the flight model its 100% dependent on the Airplane design in X-Plane. It’s very different then FSX or P3d where they use lookup database like tables to tell the plane how to move and act. XPlane uses blade theory to model the performance based on the physical design of the model, so the more real the model the more real the flight dynamics.
This like provides more detail on how X-Plane code was design when it looks at how to fly. http://www.x-plane.com/desktop/how-x-plane-works/
The default aircraft and really great, but some 3rd party designed ones are better. It just depends on the company and level of complexity they add into their designs. Here is a good example video.
Here is a free 737 project but not sure how accurate to reality it is vs paid aircraft.
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