I took a series of photos yesterday using the stock camera, GCAM 7.4 from Nikita and GCam 8 from BSG. The stock camera was more than able to produce images good enough for me. Not sure what GCam brings to the party to be fair that the stock camera doesn't. Be interesting to hear people's thoughts.
Gcam pros:
Better detail
Better hdr effect especially in potraits
Better low light performance
Stock cam pros:
Better skin tones
Better white balance and color accuracy
Better highlight clipping control in night mode but overall gcam is better
Much faster photo processing
Verdict: stock camera has gotten so much better. I remember when difference was night and day with gcam on redmi note 7. But still properly developed gcam for poco x3 may futher improve the results.