Application of Legendre Filter

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I compared filter characteristics of the followings.

Butterworth : order=3, ωp=1.0, Ap=3dB
Chebyshev Type I(Passband Ripple) : order=3, ωp=1.0, Ap=3dB
Chebyshev Type II(Stopband Ripple) : order=3, ωp=1.0, Ap=3dB, ωs=1.8
Legendre : order=3, ωp=1.0, Ap=3dB

Also I attached a figure which shows order dependency of Legendre Filter.

I don't think Legendre filter has distict advantage.
I think this shows a reason why Legendre filter is unpopular.
 

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