Performance: Unlit vs static lighting vs Unlit with fresnel

Are there performance differences between using Default lit materials with static lighting, Unlit with fresnel without lights and Unlit without lights? If so, how impactant are them for running in mobile?

Unlit would be significantly cheaper to render.

Even with fresnel?

depends on what do you mean by fresnel.

A Lerp with node A as a simple texture sample parameter, B with a vec3 parameter and a normal Fresnel material expression (Exponent=1, BaseReflectFraction=0.04 and maybe a texture sample parameter in normal) as alpha, plugged at Emissive

Yep, unlit material with fresnel node, a texture lookup and some math would still be cheaper than lit one.