We numerically analyze the mixing and pressure drop characteristics for flow through wavy micromixer of two geometrical configurations, namely raccoon and serpentine for different values of amplitude of the waviness of the mixer (α), wavelength of the waviness (λ), Reynolds number(Re) and Schmidt number(Sc). Three different flow regimes are identified depending on the parameters influencing the mixing index. The mixing index for both the raccoon and serpentine mixer is very close to unity in the first regime (0.1 < Re < Re*). Beyond Re* the mixing is better for raccoon mixer as compared to serpentine for any particular value of Re, amplitude and wavelength. In case of the absence or insignificant size of recirculation zone, beyond Re* the difference in mixing index between raccoon and serpentine mixer increases with Re, while the same decreases in presence of significant size of recirculation zone within the mixer. The pressure drop is always higher for raccoon mixer as compared to serpentine and moreover, the difference in pressure drop between raccoon and serpentine mixer increases with increase in Re. The best micromixer has been proposed based on the findings of the present analysis.