So, are these taking pictures in real color ?
For my old S8, GCam was having better pics, but was more saturated as well compared to stock cam. I liked how it looks, so wasn't an issue. Had better details & night mode was a blessing when needed.
For S20 FE 5G, stock one just looked bit brighter, nothing else. On closer inspection, stock feels a bit more saturated, but nothing major like I saw with GCam on S8. Also stock cam has better dynamic range, better details from darker regions of a scene. Noise level seems similar when zoomed.
I will say these vary phone to phone & maybe GCam port to port. So try for your phone.