Gazebo vs. FlightGear

I have been developing a slipstream-based dual-rotor tail-sitter platform similar to the PhoenixDrone, and found that Gazebo sim aerodynamics plugin is somewhat limited (e.g. huge simplification on lift and drag curve and no pitching moment support). I planned to extend the plugin, but then found an alternative that is FlightGear which might provide better dynamics simulation. I am unsure whether to continue with Gazebo aerodynamics plugin extension or go with FlightGear.

Could you guys please provide some comparison between using Gazebo and using FlightGear as a simulation platform for control algorithm development and testing?

The question was addressed in PX4 Developer Summit 2020 talk: “Open Source Workflow for Advanced Vehicle Dynamics Simulation”.