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did your FEA have square corners? A real roll/extruded steel beam would have those nice rounded edges.
Sharp corners would contribute to stress concentrations which, on the thinner beam, be a bigger problem.
In all honesty both beams would probably be fine for whatever is being done as far as bending strength. Better focus may be to look at what type/sizing of bolts to use as to not yield them and using double shear if possible etc etc etc.
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