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These fresnels are designed to work with shader components so that as roughness increases, the fresnel function is modified. The standard fresnel does not modify the shader.
Fresnel Conductor - The same effect as using a Conductor node
Fresnel Dielectric - The same effect as using a Dielectric node
Fresnel Iridescent - A perfect way to create iridescent effects. Change the quantity of Iridescence to 100 % to start with and just adjust the Thickness to see the colored effect. You won't need to adjust the Wavelength settings or Refraction Index normally, they are there for added control.
Fresnel Multiply - Multiplies two Fresnel functions together for further control
Fresnel Schlick - Schlick's approximation is a fast way of creating a fresnel effects that eschews physical correctness for speed and artistic control
These fresnels are designed to work with shader components so that as roughness increases, the fresnel function is modified. The standard fresnel does not modify the shader.