Regarding heat exchanger calculation issues

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I’m a beginner; I hope the experts on this forum can explain it to me. According to the chemical engineering process manuals, it involves using the properties of the process parameters, assuming a heat transfer coefficient, thereby determining the heat transfer area. Then, the pressure drop across the shell and tubes is calculated to ensure it meets the required criteria (this does not reflect the performance parameters of the heat exchanger)； Whether it is the simple or rigorous calculation in ASPEN or EDR, process parameter values are input directly along with pressure drops, thereby yielding specific heat exchanger performance data (including thermal resistance). Which of these two methods is more reliable? What are the differences between simple ASPEN calculations and EDR calculations, and why is there such a large difference? (What are the main reasons for this?) Also, how should one interpret the results calculated by EDR to determine whether a heat exchanger is usable? Also, since EDR yields results, then what does SW6 calculate? (I personally think EDR is the calculation of performance parameters, while SW6 is the calculation for manufacturing process approval.) ) There might have been a misunderstanding; please correct me if I’m wrong.