Should i mark Sharp edges on my low poly(Shade auto-smooth) or shade smooth for high poly to low poly baking?

Question

I did an experiment of baking into the low poly once with sharp edges and another without.

1st image is with sharp edges marked.

2nd image is without any sharp edges marked and shaded smooth.

*No custom normals.

**High poly(subd) ofc is fully shaded smooth.

***Working in Blender.

Smoky3d · Answer

I'm providing you another example in which case i have a flat surface with a simple bevel of 2 segments with profile shape 1. Without marking sharp edges before exporting the low poly i get this nasty result. Images are with Normal map applied and normal map is at 8192 resolution 16bit. In Substance painter the bake result shows fine.

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