Pavement surface deflection is essential to assess the structural performance of the pavements and for the design of most suitable rehabilitation strategies. Various deflectometer devices can extract those deflections, however, in different manners. Falling-Weight Deflectometer measures surface deflection from the impulsive and stationary load. Traffic Speed Deflectometer, in contrary, simultaneously records deflection data under vehicle-moving speed. Many studies reported the different responses from FWD and TSD under simple assumptions. Additionally, even though both devices utilize unidentical loading pattern, the deflection data is still interpreted by the same radial location, indices, and curvature. This study aimed to compare the outcomes from FWD and TSD loading by looking into the fully surface deflections and other responses under various scenarios. This comparison was numerically conducted by 3D Finite Element Method. Dynamic effect, and time-temperature dependent material. behavior were considered in the analysis. The effect of pavement thickness, material, roughness, and speed were also discussed.