In recent years estimating near surface shear wave velocity structure has gained a significant importance in engineering projects. This parameter is commonly used in geotechnical projects for classifying soil types. Among various methods for estimating shear wave velocity profile, MASW and MALW methods are most popular because of their fast performance and low cost. Mode osculation phenomenon, which happens in complex subsurface situations, is a main drawback for surface wave methods. This problem can cause a misleading interpretation of dispersion curve by the operator, which is completely hazardous for engineering projects. In this study using synthetic and real datasets we investigated this phenomenon, and showed that MALW has a far better performance facing such complex subsurface conditions.