segregated vs fully coupled solver in comsol

Hi All,

I have compared these two solvers for a heat transfer case with surface-to-surface radiation. Acutually simulation results, i.e., temperature distribution in the domain, are quite different. Then I doubt which solver can generate more accurate result for my case.

Actually I have found some discussion on the difference between segragated and fully coupled solver in this forum. But still my doubt is not cleared.

Please share your thinkings. Thanks.