The aerodynamic flow beneath a flapping wing and the resulting forces and moments resemble to a large extent the behaviour of rotorcraft flows. While there are dissimilarties between the two vehicles, analogies between the two platforms can be drawn in terms of the wake structure, induced velocities and the vehicle performance. Therefore, techniques developed for the field of rotorcraft can be adapted and applied to flapping wings for analyzing steady flight. This paper aims to draw a comparison between flapping-wing and rotary-wing aerodynamics considering the similarities and differences between the nature of the generated forces, aerodynamic simplified models and advance analysis of trim conditions in hover and forward flight. The study relies heavily on a simplified quasi-steady model coupled to a three-dimensional CFD Navier-Stokes solver. This multifidelity analysis has been to shown to be able to drive the flapping wing system to a trim solution and provide valuable insight into the fundamentals of insect flight. Furthermore, the lift-to-power ratio versus average lift was identified as a principal efficiency metric to assess the performance of flapping-wing vehicles for a given geometry and kinematic parameters.