Which case to be considered? (see description)

Same model.

force applied is 2354400N, material-MS

case-1 made part model using structural member-simulated it-got results.

case-2 made same model using parts in assembly- simulated it- got result

question- which case is prefered for the desired result if want to find displacement and stress?

                which result to be considered in case-1, upper bending or von mises

SolidworksSimulation